atom_ style ERROR

Respected Sir
I successfully installed USER-DPD in my local system. 
while running default example file. 
I found the following error
**" ERROR: Unknown atom style (../atom.cpp:487)**
**Last command: atom_style      dpd".** Please help me 
how to fix the error.

Thanking you

It is part of the USER-DPD package - include and recompile.