[gmx-users] Warning: Only triclinic boxes with the first vector parallel to the x-axis and the second vector in the xy-plane are supported.

[Mauricio Arenas Salinas]

hi all:

I try to MD a DPPC, but i have a warning: 
Warning: Only triclinic boxes with the first vector 
parallel to the x-axis and the second vector in the 
xy-plane are supported.
Box (3x3)
Box[    0]={         nan,          nan,          nan}
Box[    1]={         nan,          nan,          nan}
Box[    2]={         nan,          nan,          nan}
Can not fix pbc.
Fatal error: ci = -1 should be in 0 .. -1 [FILE nsgrid.c, 
LINE 210]

that I can make to solve this problem.
thank you very much, from Chili