hello,

when solidworks simulation solved my problem,i see several time this error, what means it?

**large problem direct sparse solver failed for constraint equations, solidworks simulation is to switch the solver to direct solver.**

is this error affect my answers?

Hi Reza,

this is due to more DOF,there is a limitation for direct sparse solver which can solve less than 5 lakhs DOF.

when DOF are more than 5 lakhs the solver will throw this error message and ask us to switch the solver to FFE.