On entry to PDSYEVX parameter number 801 had an illegal va

[Powergon]

I am calling ScaLAPACK routine PDSYEVX to compute the eigenvalues of a distributed large matrix.
It gives errors " On entry to PDSYEVX parameter number 801 had an illegal value". How it comes like this ?

The size of the whole matrix is 24^{3} * 24^{3}.

Thank you very much !