Error Processing Request: Mage registry key "_singleton/inchoo_notes/feed_updates" already exists - magento

I get this error message whenever im trying to login to magento admin after installation of inhcoo featured 2.0 (magento extension) through magento connect:
There has been an error processing your request
Mage registry key "_singleton/inchoo_notes/feed_updates" already exists
Trace:
#0 /home/.../public_html/app/Mage.php(222): Mage::throwException('Mage registry k...')
#1 /home/.../public_html/app/Mage.php(476): Mage::register('_singleton/inch...', false)
#2 /home/..../public_html/includes/src/__default.php(20995): Mage::getSingleton('inchoo_notes/fe...')
#3 /home/...../public_html/app/Mage.php(447): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#4 /home/..../public_html/includes/src/__default.php(13663): Mage::dispatchEvent('controller_acti...', Array)
#5 /home/..../public_html/includes/src/Mage_Adminhtml_Controller_Action.php(160): Mage_Core_Controller_Varien_Action->preDispatch()
#6 /home/..../public_html/includes/src/__default.php(13543): Mage_Adminhtml_Controller_Action->preDispatch()
#7 /home/..../public_html/includes/src/__default.php(17899): Mage_Core_Controller_Varien_Action->dispatch('login')
#8 /home/..../public_html/includes/src/__default.php(17456): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#9 /home/..../public_html/includes/src/__default.php(20033): Mage_Core_Controller_Varien_Front->dispatch()
#10 /home/..../public_html/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#11 /home/..../public_html/index.php(89): Mage::run('', 'store')
#12 {main}
Error log record number: 214959287644
how can I fix this problem? please help

This specific error happens when a singleton (model or helper) is attempted to be invoked but cannot be mapped. Based on the path which I'm seeing in the stack trace, it looks as though you have compilation enabled. You should disable compilation while attempting to install this module, which can be done in the admin GUI at System > Compilation.

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Magento with RedisLab Redis Cluster Backend

Magento RedisLab cluster Integration Problem
After we deploy cluster redis database , FPC and Session working perfectly but when we add cluster redis ( RedisLab ) instance with Magento Cache section we are facing one problem.
When click ADD TO CART >> show cannot add product
Backend Error
Next exception 'Zend_Cache_Exception' with message 'Error cleaning cache by mode matchingAnyTag: ERR CROSSSLOT Keys in request don't hash to the same slot (command='SUNION', key='zc:ti:da3_QUOTE_2156255')' in /var/www/magento/lib/Zend/Cache.php:209
Stack trace:
3
#6 /var/www/magento/app/code/core/Mage/Core/Model/Abstract.php(464): Mage_Core_Model_Abstract->cleanModelCache()
#7 /var/www/magento/app/code/core/Mage/Sales/Model/Quote.php(333): Mage_Core_Model_Abstract->_afterSave()
#8 /var/www/magento/app/code/core/Mage/Core/Model/Abstract.php(319): Mage_Sales_Model_Quote->_afterSave()
#9 /var/www/magento/app/code/core/Mage/Sales/Model/Quote.php(1966): Mage_Core_Model_Abstract->save()
#10 /var/www/magento/app/code/core/Mage/Checkout/Model/Cart.php(459): Mage_Sales_Model_Quote->save()
#11 /var/www/magento/app/code/core/Mage/Checkout/controllers/CartController.php(223): Mage_Checkout_Model_Cart->save()
#12 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Checkout_CartController->addAction()
#13 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('add')
#14 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#15 /var/www/magento/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#16 /var/www/magento/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#17 /var/www/magento/index.php(85): Mage::run('', 'store')
#18 {main}
If i disable the exception then its working file
/var/www/magento/lib/Zend/Cache.php:209
Just got the same exception like you , I believe that case belong to your custom work try to make magento working with redis-cluster
My solution :
just remove exception in redis-client.php library first and return IP:PORT
find the correct client by byHash function in redis-cluster.php
execute the command with correct client
Need to overwrite load , remove , _removeByMatchingTags...

Magento error after migration "Cannot send headers, Headers already sent in"

I am getting the following error (after I moved magento from once server to another)
a:5:{i:0;s:110:
"Cannot send headers; headers already sent in /home/user/public_html/lib/Varien/Event/Collection.php, line 1";
i:1;s:1013:"
#0 /home/user/public_html/lib/Zend/Controller/Response/Abstract.php(114): Zend_Controller_Response_Abstract->canSendHeaders(true)
#1 /home/user/public_html/app/code/core/Mage/Core/Model/App.php(1265): Zend_Controller_Response_Abstract->setHeader('Content-Type', 'text/html; char...')
#2 /home/user/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(80): Mage_Core_Model_App->getResponse()
#3 /home/user/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(202): Mage_Core_Controller_Varien_Front->getResponse()
#4 /home/user/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#5 /home/user/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#6 /home/user/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#7 /home/user/public_html/index.php(83): Mage::run('', 'store')
#8 {main}
";s:3:"url";s:1:"/";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:5:"dutch";}
I have solved my issue some other way.
This was magento 1.9.1 & i update it to 1.9.2.2, site came back as normal but some blocks were not showing on front page. I followed this https://magentary.com/kb/cms-pages-transactional-emails-broken-after-supee-6788-patch/
and the issue almost resolved
Thanks.

Cannot access magento admin panel?

When I try to access admin panel on magento , It returns this error :
There has been an error processing your request
Mage registry key "_resource_helper/core" already exists
Trace:
#0 /home6/domain/public_html/app/Mage.php(223): Mage::throwException('Mage registry k...')
#1 /home6/domain/public_html/app/Mage.php(563): Mage::register('_resource_helpe...', false)
#2 /home6/domain/public_html/app/code/core/Mage/Core/Model/Resource/Db/Collection/Abstract.php(534): Mage::getResourceHelper('core')
#3 /home6/domain/public_html/app/code/core/Mage/Core/Model/Resource/Db/Collection/Abstract.php(520): Mage_Core_Model_Resource_Db_Collection_Abstract->_prepareSelect(Object(Varien_Db_Select))
#4 /home6/domain/public_html/lib/Varien/Data/Collection/Db.php(566): Mage_Core_Model_Resource_Db_Collection_Abstract->getData()
#5 /home6/domain/public_html/app/code/core/Mage/Core/Model/Resource/Website/Collection.php(137): Varien_Data_Collection_Db->load(false, false)
#6 /home6/domain/public_html/lib/Varien/Data/Collection.php(729): Mage_Core_Model_Resource_Website_Collection->load()
#7 /home6/domain/public_html/app/code/core/Mage/Core/Model/App.php(634): Varien_Data_Collection->getItemById('0')
#8 /home6/domain/public_html/app/code/core/Mage/Core/Model/App.php(466): Mage_Core_Model_App->_initStores()
#9 /home6/domain/public_html/app/code/core/Mage/Core/Model/App.php(349): Mage_Core_Model_App->_initCurrentStore('', 'store')
#10 /home6/domain/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#11 /home6/domain/public_html/index.php(90): Mage::run('', 'store')
#12 {main}
What's the problem ? It hasn't any problem before , I just saw this error suddenly this morning .
And Also , I've tried these ssh shell commands :
rm -rf var/cache/* var/session/*
And even I've deleted these folders contents by cpanel . But still it gives that error .
How can I fix it ?
you need to go to your phpmyadmin
search the DB for this key
then remove the key or rename the value.

Magento Error: SQLSTATE[HY000] [1045] Access denied for user 'MYSITE_magento'#'localhost' (using password: YES)

I have copied a magento site from one server to another, hoping to make a carbon copy of a shop.
I exported/imported the database via phpMyAdmin and I zipped and unzipped the site files.
Everything is there. I have doubled checked the db passwords and details. I have also checked all of the file/folder permissions are correct. Still I get the error.
This error says ...
There has been an error processing your request
Exception printing is disabled by default for security reasons.
Here are the contents of my Magento error log:
a:4:{i:0;s:97:
"SQLSTATE[HY000] [1045] Access denied for user 'MYSITE_magento'#'localhost' (using password: YES)"
;i:1;s:2792:"
#0 /home/MYSITE/public_html/lib/Zend/Db/Adapter/Pdo/Mysql.php(96): Zend_Db_Adapter_Pdo_Abstract->_connect()
#1 /home/MYSITE/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php(251): Zend_Db_Adapter_Pdo_Mysql->_connect()
#2 /home/MYSITE/public_html/lib/Zend/Db/Adapter/Abstract.php(448): Varien_Db_Adapter_Pdo_Mysql->_connect()
#3 /home/MYSITE/public_html/lib/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('SET NAMES utf8', Array)
#4 /home/MYSITE/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php(333): Zend_Db_Adapter_Pdo_Abstract->query('SET NAMES utf8', Array)
#5 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Resource/Type/Db/Pdo/Mysql.php(45): Varien_Db_Adapter_Pdo_Mysql->query('SET NAMES utf8')
#6 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Resource.php(93): Mage_Core_Model_Resource_Type_Db_Pdo_Mysql->getConnection(Object(Mage_Core_Model_Config_Element))
#7 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Mysql4/Abstract.php(297): Mage_Core_Model_Resource->getConnection('core_read')
#8 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Mysql4/Abstract.php(312): Mage_Core_Model_Mysql4_Abstract->_getConnection('read')
#9 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Mysql4/Abstract.php(332): Mage_Core_Model_Mysql4_Abstract->_getReadAdapter()
#10 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Mysql4/Collection/Abstract.php(97): Mage_Core_Model_Mysql4_Abstract->getReadConnection()
#11 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Config.php(1206): Mage_Core_Model_Mysql4_Collection_Abstract->__construct(Object(Mage_Core_Model_Mysql4_Website))
#12 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Config.php(1239): Mage_Core_Model_Config->getModelInstance('core_mysql4/web...', Object(Mage_Core_Model_Mysql4_Website))
#13 /home/MYSITE/public_html/app/Mage.php(460): Mage_Core_Model_Config->getResourceModelInstance('core/website_co...', Object(Mage_Core_Model_Mysql4_Website))
#14 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Abstract.php(208): Mage::getResourceModel('core/website_co...', Object(Mage_Core_Model_Mysql4_Website))
#15 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/Abstract.php(213): Mage_Core_Model_Abstract->getResourceCollection()
#16 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/App.php(532): Mage_Core_Model_Abstract->getCollection()
#17 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/App.php(393): Mage_Core_Model_App->_initStores()
#18 /home/MYSITE/public_html/app/code/core/Mage/Core/Model/App.php(299): Mage_Core_Model_App->_initCurrentStore('', 'store')
#19 /home/MYSITE/public_html/app/Mage.php(596): Mage_Core_Model_App->run(Array)
#20 /home/MYSITE/public_html/index.php(80): Mage::run('', 'store')
#21 {main}
";s:3:"url";s:10:"/~MYSITE/";s:11:"script_name";s:19:"/~MYSITE/index.php";}
Obviously I replaced my site name above with MYSITE.
This issue can be created for local.xml .First,check database username ,database name,datauser password..... etc in local.xml (path yourmagentodir/app/etc/)
Check there have any local.xml.bak.If exits then delete local.xml.bak.
check database permission issue for database user.
Clear cache from cache folder (path yourmagentodir/var/cache/)
It was in deed a corrupt database. Thanks for drilling this into me guys as it forced me to keep rechecking the db

Magento Zend Mail using Google SMTP

I'm having troubles with mail sending in Magento: simply emails are not being sent in case of customer registration, order confirmation ecc.
I checked the exception log and this is what I found:
exception 'Zend_Mail_Protocol_Exception' with message '5.7.1 Username and Password not accepted. Learn more at
5.7.1 http://support.google.com/mail/bin/answer.py?answer=14257 q42sm2096509eem.14 - gsmtp
' in /srv/www/htdocs/lib/Zend/Mail/Protocol/Abstract.php:431
Stack trace:
#0 /srv/www/htdocs/lib/Zend/Mail/Protocol/Smtp/Auth/Login.php(95): Zend_Mail_Protocol_Abstract->_expect(235)
#1 /srv/www/htdocs/lib/Zend/Mail/Protocol/Smtp.php(217): Zend_Mail_Protocol_Smtp_Auth_Login->auth()
#2 /srv/www/htdocs/lib/Zend/Mail/Transport/Smtp.php(200): Zend_Mail_Protocol_Smtp->helo('localhost')
#3 /srv/www/htdocs/lib/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Smtp->_sendMail()
#4 /srv/www/htdocs/lib/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#5 /srv/www/htdocs/app/code/core/Mage/Core/Model/Email/Template.php(465): Zend_Mail->send(Object(Zend_Mail_Transport_Smtp))
#6 /srv/www/htdocs/app/code/core/Mage/Core/Model/Email/Template.php(517): Mage_Core_Model_Email_Template->send(Array, Array, Array)
#7 /srv/www/htdocs/app/code/core/Mage/Core/Model/Email/Template/Mailer.php(79): Mage_Core_Model_Email_Template->sendTransactional('customer_create...', 'general', Array, Array, Array, '1')
#8 /srv/www/htdocs/app/code/core/Mage/Customer/Model/Customer.php(650): Mage_Core_Model_Email_Template_Mailer->send()
#9 /srv/www/htdocs/app/code/core/Mage/Customer/Model/Customer.php(577): Mage_Customer_Model_Customer->_sendEmailTemplate('customer/create...', 'customer/create...', Array, '1')
#10 /srv/www/htdocs/app/code/core/Mage/Customer/controllers/AccountController.php(344): Mage_Customer_Model_Customer->sendNewAccountEmail('confirmation', 'http://test.col...', '1')
#11 /srv/www/htdocs/app/code/core/Mage/Core/Controller/Varien/Action.php(419): Mage_Customer_AccountController->createPostAction()
#12 /srv/www/htdocs/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('createpost')
#13 /srv/www/htdocs/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#14 /srv/www/htdocs/app/code/core/Mage/Core/Model/App.php(354): Mage_Cor_Controller_Varien_Front->dispatch()
#15 /srv/www/htdocs/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#16 /srv/www/htdocs/index.php(87): Mage::run('', 'store')
#17 {main}
I didn't know about the Zend Mail Protocol, anyway, from what I see, this is trying to use SMTP authentication on a Google server; the fact is I have not installed any extension to use SMTP in Magento, so I have never set up any username or password; besides I'm using localhost in Magento mail sending settings, so anyone has an idea of what happened and can suggest me a workaround?
Thank you!

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