I compiled HYPHYMPI with the mod provided by someone in the forum for openmpi - it compiled successfully. But I just can't figure out how to pass the path to the .nex input file!

the error is  (from the HYPHYMPI interface):

Please choose an option (or press q to cancel selection):
lysozyme-input.nex             
/prog/HYPHY_Source/GABranchFiles/Codon file to analyze::Error:MPI Node:0
Could not create/open output file
Current BL Command:Print to File modelFile:CLEAR_FILE

[node-root:06606] *** Process received signal ***
[node-root:06606] Signal: Segmentation fault (11)
[node-root:06606] Signal code: Address not mapped (1)
[node-root:06606] Failing at address: 0x31
mpiexec noticed that job rank 0 with PID 6606 on node node-root exited on signal 11 (Segmentation fault).
3 additional processes aborted (not shown)

I got this when i ran:

mpiexec -np 9 /prog/HYPHY_Source/HYPHYMPI BASEPATH=/prog/HYPHY_Source/ GABranchFiles/ModelSelectorBranchLocal.bf

as root user and as a non-root user

can somoene explain to me how everything in hyphy works and how hyphy gets the path?