From: Ms. Nabila Tahreen (
Date: Tue Jun 01 2010 - 23:47:08 CDT

I'm a new user of NAMD.I'm trying to run the "user-defined-force" tutoorial. But every
time while running the tclforces simulation the system is showing some error messages

TCL: can't read "masses(1)": no such element in array
FATAL ERROR: can't read "masses(1)": no such element in array
    while executing
"vecscale $masses($atom) $linaccel_namd"
    (procedure "calcforces" line 11)
    invoked from within

Can you please suggest me why I'm facing this problem and how to solve it.

Ms. Nabila Tahreen
Department of Industrial and Production Engineering
Bangladesh University of Engineering and Technology
Dhaka-1000, Bangladesh

Phone: 880 2 966 5650 (PABX)
FAX: 880 2 861 3026, 880 2 861 3046

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