> > > > [0]PETSC ERROR: Petsc has generated inconsistent data! > [0]PETSC ERROR: Unhandled case, must have at least two fields, not 1
This can happen if you give fieldsplit options to a non-fieldsplit matrix/PC. So so calling XXXSetFromOptions with a KSP/PC and an AIJ Mat (ie, non-nested Mat) and using a parameter like '-pc_fieldsplit_type schur', will give you this error.
