Hey bag
to put it right (and I don't know if that's possible) we need to know exactly what you did to cause the problems.
I think I've had the 'no valid repository' response before - disable and maybe re-enable test execution history can get you around this....'I think'.
see the following: link1
and link2
you say you can't run any project now (which is kindof impressive if you broke every project! :)) but I'm wondering - is it every project? Reason I ask is from the trace below - it mentions the same project twice and a testsuite - not another project....
So - if you could provide details of what you did and the sequence in which you did those things, we might be able to sort it out for you, but it would help a lot if we knew exactly what you did.
Cheers,
richie