Enforce Displacement

Hi,

I am running a Nonlinear DTRAN analysis, which involves sliding contact.

I want to enforce a displacement of 40 mm.

Using SPCD in constraint errors out

 A fatal error has been detected during input processing:

  *** ERROR # 186 ***
  An SPCD component must be constrained by an SPC or SPC1 data.
       GRID ID = 163082
     component = 3
   LOAD set ID = 8
    SPC set ID = 2
    subcase ID = 1

Please help me in resolving