@Fazeela_Gul , Please Read This First: Guidelines and Suggestions for posting LAMMPS questions.
Posting the exact same question three times won’t increase your chances to receive meaningful advice. The only one I can recommend you is not to panic and start studying the examples provided with LAMMPS (you have to download the source code for that). On top, you should demand proper supervision from the people who assigned you the task of simulating a glass. I am afraid, this forum is no substitute for university research training.
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