I have a project under source control and anytime I try to check in one of the solutions I get this error message 
I’ve not got a project GlassButtons so I have no idea what SVN is looking for.
I have a project under source control and anytime I try to check in
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A possible reason is the following:
There once was a folder GlassButtons that has been added to your local working copy (SVN Add) and deleted afterwards from the disk. This will lead to the situation you encounter: AnkhSVN tries to commit that folder and therefore wants to read it from the disk, but it doesn’t exist anymore, so it gives this error.
The following should help you:
Now your working copy should be fine again.