i don't know how to proove it but i install it whith ppm succesufuly !

well, ppm doesn't include a test suite. You can still download from cpan and run the test suite yourself.

If the test suite fails spectacularly, you've found your problem.

Usually, to prove it, (as Corion describes) you'd explain each step you took, so that someone else can replicate those exact steps, and then trigger the same error