Corrected the error message to make it more clear.
Corrected the error message to make it more clear.

pgmpy/pgmpy,sandeepkrjha/pgmpy,abinashpanda/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,khalibartan/pgmpy,ankurankan/pgmpy,pgmpy/pgmpy,anaviltripathi/pgmpy,jhonatanoliveira/pgmpy,yashu-seth/pgmpy,anaviltripathi/pgmpy,palashahuja/pgmpy,kris-singh/pgmpy,ankurankan/pgmpy,liquidmetal/pgmpy,jhonatanoliveira/pgmpy,palashahuja/pgmpy,yashu-seth/pgmpy,pratyakshs/pgmpy,liquidmetal/pgmpy,abinashpanda/pgmpy,kris-singh/pgmpy,vivek425ster/pgmpy,pratyakshs/pgmpy,vivek425ster/pgmpy