Dear Group,
1)
I backed up my entire codebase.
2)
I tried to checkout the codebase in a new folder.
Was lucky, it worked.
This confirmed that the error was caused by a corrupt or missing file, as per the report, in the ".svn" pristine folder
I deleted the .svn folder from the backed up copy, and copied all its data over the newly checked out build, to restore my unchecked changes.
Checked everything back in, worked
Solved.
Regards, Elie