It seems related to your parameter file. I presume in the structure you are simulating there is an insulator material ( or more). Check the eDOSMass section, and follow the instructions (that is that parameters a and ml are both set to zero).

Thanks a lot

have tried it, both the values are zero and still the SAME error is persisting

"In insulators , for electron mass you can only use formula 1 with a=ml=0!"

any suggestions ??

The sentence is referred to the parameter file. If you have checked all the insulator material sections you have in your parameter file, then the only thing left is debug your program brick by brick. Not having any idea about what device architecture you are trying to simulate, and which models are you implementing, it is difficult to be more specific. For instance: are you using workbench? if you use workbench, have you checked if the preprocessing stage was all ok? if the answer is positive, then you can try to simplify as much as possible both your structure (sde) and the physics (sdevice), until the program will run. Then add little by little the pieces you need until you will get again the same problem. This should make you understand where is exactly the problem.

Ok thanks. I will check step by step

Ravi Tek Kaluva Did you solve this problem ??.. I'm facing the same situation