svn cleanup does not work

Hi,

i got very often such messages using svn:

E:\Projects\Logisco\Usocome>svn cleanup WebChannel

svn: Can't open directory 'WebChannel/WebChannel/ppc/.svn/tmp': Das System kann den angegebenen Pfad nicht finden.

Nearly all .tmp directories missing !!! I have looked in the user mailing list, but don´t found any solution.

But I can say:

I never touches the .svn directoy manually !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Hope someone can help.