Magento: "configForm is not defined" error when saving admin settings - magento

I get this error when I try to save an some settings on the admin. At least so far, I've noticed it happens in the system/advanced section and on a plugin (color picker) I want to deactivate.
Uncaught ReferenceError: configForm is not defined
onclick
Any idea?
Thanks

The problem in the /magento/js/prototype/validation.js corrupted.
Just replace it with the original version from backup files or from fresh magento and it will works.

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There has been an error processing your request
Exception printing is disabled by default for security reasons.
Error log record number: 1130478184
I think you have to first check in your error log number "1130478184" where you exactly know what is the issue. I think from your given link which you refer your issue must be occured from theme.xml file's <preview_image>media/preview.jpg</preview_image> line. You have to try with comment following code in theme.xml file:-
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> Uncaught TypeError: Cannot read property 'isValid' of null
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There has been an error processing your request
Exception printing is disabled by default for security reasons.
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Try this,
Rename file local.xml.sample to local.xml
file location : magentoRootDirectory/errors/
Please check your server max_execution_time using phpinfo(); and increase it if its value is too less. I hope this will solve your problem
Thanks

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on line 12
I think it happened when I replaced some files somewhere in app/code/...
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Error is in your extension file TM/Core/Model/Observer.php
Disable extension and check after refresh cache
This was fixed by the Full Page Cache Extension people.
I don't know what they did but it was their extension which broke my magento however they fixed it for me right away

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cheers tabaluga
Your screenshot (and from the looks of it Magento's error page) clips the edge of the error off. Seeing the rest of the error message might be important. Regardless, it looks like Magento is trying to load a config file w/ simplexml, and cannot find that file.

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