What should I check when Vtune reports zero CPU usage and time?

Hi,
Am profiling my application program which uses both MPI and OpenMP (Both from Intel Parallel Studio)
I use the following command to run the profiler:

mpiexec.hydra -genvall -n 32 -machinefile ./machines -gtool "amplxe-cl -c hotspots -r {DirectoryPath}:0=node-wide" {BinaryFile} {Arguments ...}

The results show (The program ran for 2 minutes):

CPU Time:           0.000
Average CPU Usage:  0.0

What should I check first? Can any one give me advice on it?

Thanks