Magento Admin Panel error message: Fatal error: spl_autoload() [<a href='function.spl-autoload'>function.spl-autoload</a>]: - magento

When attempting to login to the Magento admin panel, I am faced with the error message below. I could login fine yesterday and made no changes, so cannot understand why an error has occurred and am not sure how to resolve this one.
Fatal error: spl_autoload() [function.spl-autoload]: Class
Zend_Log_Exception could not be loaded in
/homepages/34/d502468010/htdocs/lib/Zend/Log/Writer/Stream.php on line
135

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I have installed WorldPay Extension and its was working fine but from last few days I face issue. Response URL not call and through fatal error
I got email each time from worldpay and they mentioned they got following error
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failed CAUSED BY Received fatal
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Server Reference: ukdc1-pz-cen09:callbackFailureEmail-1312:MerchReq-626-40
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can one have idea how to solve this?

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I am installing the Magento and followed all the steps and passed all the requirements, yet it throws an error at the last step of installation.
Error Log:
[ERROR] exception 'InvalidArgumentException' with message 'Invalid backend frontname ' in /var/www/mysite/magento2/lib/internal/Magento/Framework/App/DeploymentConfig/BackendConfig.php:32
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MAGMI session_write_close Product Import Error

I'm having troubles setting up MAGMI on my site, every time I got to import products I am shown this error:
Warning: session_start():
open(/var/lib/php/session/sess_a80ks0ag182lknvd8bfc052qe6, O_RDWR)
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Warning: session_write_close():
open(/var/lib/php/session/sess_a80ks0ag182lknvd8bfc052qe6, O_RDWR)
failed: Permission denied (13) in
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If anyone could shed some light on this I would greatly appreciate it!
Many thanks,
The error message is quite clear. The user running Magmi does not have the permission to create sessions to the current session_save_path for PHP.
You can address this by reading over the solutions covered in How can I fix the Permission error when I call session_start()?

magento PHP Fatal error: Class 'Varien_Data_Tree_Node_Collection'

after moving my mangento installation fromm mywebsite.com/mangento To mywebsite.com
I get an error message:\
my magneto is displaying "Site Down For Maintenance" with white screen
I get an error in my error_log file
PHP Fatal error: Class 'Varien_Data_Tree_Node_Collection' not found in public_html/lib/Varien/Data/Tree.php on line 51
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There is a probability that during upload/Move some files were not uploaded successfully

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