MutSig CV No mutations left error.

Hi there!

I've been trying to run MutSigCV on the Broad Institute GenePattern server and I get this error "Error using gp_MutSigCV>MutSig_preprocess (line 314)
No mutations left!

Error in gp_MutSigCV (line 184)
"

What exactly is going on here and how do I fix the error?

Best wishes,
Ankur Chakravarthy,
UCL Cancer Institute.