Problem:
An SVN conflict caused the .flexProperites and .asProperties files to be deleted. This caused Flex Builder to prompt “Error Loading Project” with the message “A problem occurred when opening project “Your Project”. Try quitting and restarting the application. If the problem persists, you might be using an unsupported project version, or your project files might be corrupt.

Put simply, a developer checked in their .properties files, which cause an error when doing an SVN update, and was resolved by removing these files from SVN. The next time anybody did an update on the root directory of the project after the files were removed the local copies where removed.

Error Loading Project

Solution:
Add the missing files back to your root directory and use SVN ignore on the .flexProperties and .asProperties files. Best practice would be to set up SVN to ignore these project specific files. It is also important to rename and keep a ‘copy’ of your .asProperties file (for example asProperties, without the dot). This allows new team members to download the project, add the dot and have the project correctly set up.

Has anyone else come across this same prompt using Flex Builder 3 and found a different cause / solution? Please post a comment with any other insight on this error.

I would like to give credit to Clayton (file_cabinet) for coming up with the solution to this problem. Thanks Clayton!

Links:
Subclipse
Tortoisesvn