Mutsig Error

Does anyone know what is causing this error
I am running mutsig on gene pattern from a maf created using oncotator.

Error using fgets
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in fgetl (line 34)

Error in gp_MutSigCV>load_struct (line 1441)

Error in gp_MutSigCV>MutSig_preprocess (line 304)

Error in gp_MutSigCV (line 184)

MATLAB:FileIO:InvalidFid
Traceback (most recent call last):
File "/xchip/gpprod/servers/genepattern/taskLib/MutSigCV.1.12591/run_matlab.py", line 65, in
subprocess.check_call(matlabCommand)
File "/broad/software/free/Linux/redhat_5_x86_64/pkgs/python_2.6.5/lib/python2.6/subprocess.py", line 498, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/xchip/gpprod/servers/genepattern/taskLib/MutSigCV.1.12591/gp_MutSigCV', '/xchip/gpprod-upload/servers/genepattern/users/vyellapa/uploads/tmp/run7186293850752403022.tmp/mutation.table.file/1/master.maf', '/xchip/gpprod/shared_data/example_files/MutSigCV_1.3/exome_full192.coverage.txt', '/xchip/gpprod/servers/genepattern/jobResults/838685/gene.covariates.txt', 'masterhmcl', '/xchip/gpprod/shared_data/cga/annotation/ucsc/hg19']' returned non-zero exit status 255