[gmx-users] fatal error

[Sonali]

hi everybody,
i am a new user of gromacs,while trying to run with the tool g_covar for
finding out an average running structure i am getting the following error.

Program g_covar, VERSION 3.3
Source code file: smalloc.c, line: 113

Fatal error:
calloc for mat (nelem=997170084, elsize=4, file gmx_covar.c, line 219)
-------------------------------------------------------

"Whatever Happened to Pong ?" (F. Black)
: Cannot allocate memory

when asked with the option to select the groups i had selected protein and
backbone,
please help ,
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