AMBER: amber with periodic condition

From: Mattia Mori - CERM <>
Date: Mon, 29 Oct 2007 18:16:14 +0100
Dear amber users,
I'm trying to apply sander for a molecular dynamics steps of a solvated peptide after some minimizations steps.
In tleap I've loaded the pdb of the minimized peptide including the waterbox used during minimization, but when I try to impose ntb=2 I always get this error:  

getting new box info from bottom of inpcrd
peek_ewald_inpcrd: Box info not found in inpcrd
Largest sphere to fix in unit cell has radius = 0.000

how can I work in periodic conditions starting from a water-including pdb? How can I impose my box dimension?
thank you

Mattia Mori

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