Hi Alan, Probably you need to get a newer Chimera. You didn’t say what version of Chimera you were using, but Gromacs support was added after the 1.10 release, so you would need to get a 1.11 daily build. Changes since 1.10: <http://www.rbvi.ucsf.edu/chimera/docs/relnotes/snapshot.html> Download daily build: <http://www.rbvi.ucsf.edu/chimera/download.html#daily> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Apr 3, 2015, at 2:56 PM, Alan Manning <mannin2@physics.ubc.ca> wrote:

Hi I want to import a Gromacs trajectory (a .trr file) in order to create an animation. I'm using the "MD Movie" tool, and I specify the input .tpr and .trr files. However, I get the following error when I try and make the movie:

Don't know correct parameters for 'bham_lr' function

Does anyone know what this is from? I'm using Gromacs 5.0.4. The complete Reply Log is as follows:

using memory mapping VERSION 5.0.4 using floats version 100, generation 26 2613 atoms box o water Don't know correct parameters for 'bham_lr' function

Thanks! Regards, Alan Manning