Hi there,

tried to update from 3.1.5 to 3.1.6 and did get the following error when doing a /dev/build:

Fatal error: Uncaught exception 'Exception' with message 'There are two files containing the "SiteTreeExtension" class: "/Users/.../cms/code/model/SiteTreeExtension.php" and "/Users/.../mysite/code/extensions/SiteTreeExtension.php"' in .../framework/core/manifest/ClassManifest.php:396 Stack trace: #0 [internal function]: SS_ClassManifest->handleFile('SiteTreeExtensi...', '/Users/...', 3) #1 .../framework/filesystem/FileFinder.php(158): call_user_func(Array, 'SiteTreeExtensi...', '/Users/...', 3) #2 /Users/.../framework/core/manifest/ClassManifest.php(311): SS_FileFinder->find('/Users/...') #3 /Users/.../framework/core/manifest/ClassManifest.php(135): SS_ClassManifest->regenerate(true) #4 /Users/.../framework/core/Core.php(102): SS_ClassManifest->__construct( in /Users/.../framework/core/manifest/ClassManifest.php on line 396

Anyone any idea? Thanks in advance!

- Mario

Have you tried deleting the temporary folder? On most Linux servers it'll be just `rm -rf /tmp/silverstripe*` or something.

A flush should fix this too, though I've had issues getting the flush to actually run when you're in this state.

The problem is that you’ve got a file which contains a class named “SiteTreeExtension” when there’s already a class with this name in the core code. You’ll need to rename the extension in mysite/code/extensions to something else.

Ok, sounds plausible, but it did work before.

There was a bug which meant that duplicate classes weren’t being detected - it’d simply “override” one of them and it wouldn’t be loaded. That was resolved for 3.1.6, so that’s why it didn’t happen before :)

All right, @kinglozzer. I can definitely live with errors caused by improvements.

Thanks.

You call that a bug, I call it a feature. Removing it causes bugs.