Girish,
Are you trying to enter PDMS loading from a binary?
Try to enter loading from macro files. If it works, go to Settings > Graphics > Representation and set the arc tolerance for a value above 1.
After that, save another Forms & Display in order to avoid future problems.
I think error is te solve now, but i have one more solution . Go to your PDMS folder, pdmsuser then open des-rep.pmldat and change value of !!tmpgphrepopt.arctolerance=2