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I'm upgrading from 2.5.2 to 2.5.5 and in the upgrade process everything went well until I tried to go from 2.5.4 to 2.5.5. When I hit the link to upgrade to 2.5.5 I am now getting the following error:

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Server error The website encountered an error while retrieving http://domain.com/admin.php?C=wizard&M=do_update&language=english&ajax_progress=yes. It may be down for maintenance or configured incorrectly. Here are some suggestions: Reload this webpage later. HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.

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Has anyone come across this before? Any advice greatly appreciated. I can confirm that the server is up - it's just when I get this that I receive the error.

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    Is your third_party folder empty, or are there add-on folders still in it? – Steve Jan 9 '13 at 16:31
  • Have you tried temporarily blanking your .htaccess file? It is often the culprit in Internal Server Errors. – Derek Hogue Jan 9 '13 at 17:14
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I was able to figure this out. Ultimately the issue was that there was a module still installed in the system directory when i was running the upgrade. Was able to glean this bit of information by changing debug to 1 in the admin.php file and reloading it for the upgrade. Once that was figured out I cleared out the rogue module and everything went normally.

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For me, temporarily renaming my system/expressionengine/third_party folder until the upgrade completed and then renaming it back worked.

Interestingly enough, the update script had updated the app_version variable in config.php to 254 before it failed (I was upgrading from 2.5.3). Not sure if that helps anyone figure out where in the process it's failing, but I wonder if there's anything that the 254/255 part of the update which touches the third_party folder that's causing the failure.

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