inAdequate fixture Error while rerunning by making simple changes in static study.

hi,

I am suffering from error showing inadequate fixture.

I had getting error while rerunning the simulated assay. by making simple changes in the study like by changing load or load location.

for getting  accuracy as compared to actual system i m simulation on assembly from last 3weeks.

by following same procedures while working with my model.

solid works simulation sometimes simulate the model but some times it gives me error.

Kindly help if someone observed such problem.

Rgd,

Nakul