not a number error

From: Mohaddeseh Habibzadeh (
Date: Mon Jan 09 2017 - 01:53:08 CST

I was running npt MD with NAMD after minimization and heating
steps, and after passing 1700 frames normally, suddenly it wrote -nan in
 out put file for energies.
And I couldn't see the pdb file after 1700 frame, it disapears!!
May I know what's the reason and how it could be solved?
Any help would be appreciated.

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