[gmx-users] error in topology file

[hhhh huan]

Dear all gmx users and developers,

After i run the grompp, there were two warnings
appeared. The warning statements are as follow:

warning 1 [File "p1.top" line 208]
         No default Ryckaert-Bell. type, using zeros.

warning 2 [File "p1.top" line 209]
         No default Ryckaert-Bell. type, using zeros.

I checked the lines as stated in the warning, but i
didn't realize what is the problems.

Any suggestions and solutions are appreciated.

THANKS.