A similar problem resolved by this user should be a pointer
I had a similar problem with MKACTIVITY on googlecode. this was because I checked the repository with http :, but check-ins required https :.
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You need to either double-check the folder with https: (or if you hide clear the folder except .svn, and then change the contents of .svn / entries, which has a URL from http => https. Now the commit screen will display the https URL
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