In Netbeans using SVN Subversion you get the following error when you try and sync/checkout files.

svn: Repository UUID '1a063a9b-81f0-0310-xxxxx etc' doesn't match expected UUID '7be80a69-xxxxxx etc'
(I've xxxxx'd out some of the UUID numbers in case they were sensitive in nature)

Notes

• You can't switch from one repository to another. You will have to check out WordPress 3.0 and overwrite your SVN.

• that you have to backup the custom directories (themes, plugins etc) and then do a new install. So deleting all the existing files/directories and doing a new CO with the WP 3.0 code.

• The --relocate flag is used to relocate a SVN to a new URL, but it must be the same SVN repo. A SVN has a GUID and the GUID has to be the same at the new location as the GUID at the old location.

• Files in a local repository have a reference stored in their .svn file, the GUID. These GUID must match those stored in the remote repository. Sometimes they can become mismatched causing this error.

Solution

• Backup files in your local repository
• delete all the files including hidden ones from your local repository
• checkout files again using SVN Subversion.
• swapped any files that had not been updated and they will then be reflected in the remote repository and a checkout is run again.