"Not under version control" error

Hi chaps,

We have SVN running on a linux box and use tortoise SVN on the clients (all windows). The users are reporting that one of the projects is causing an error when they try to download it this morning. The error is;

In directory c:\working\project name\assets\foldername
Error processing command 'modify-wcprop' in 'c:\working\project name\assets\foldername'
'c:\working\project name\assets\foldername\filename.jpg' is not under version control

If we do a cleanup we get the same error. We've even tried a new machine, installing tortoise and downloading the project on that only for the red ! to appear as well.

Any ideas what the error means, and how something can get in to the project via SVN without it being under version control? More importantly, how can we resolve it ?

Olly

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