Subversion errors creating new solutions

Good day,

I have started receiving errors when creating new solutions. The errors are:

    The node <solution name> was not found

    Can't find parent directory's node while trying to add <solution directory>

    Can't find parent directory's node while trying to add assemblyInfo.cs

If I turn off the option 'Subversion Options - Automatically add new files' the error doesn't occur.

It appears to me that the issue is a Subversion issue, but don't know where to look or what to try...

Any suggestions?

Thanks

Doug