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Simulation is working in NX 10 and it is not working in NX11


Hello Together,


I built a motion simulation for an assembly which was working fine in NX 10. After migrating from NX 10 to NX 11, the same assembly is not working.
Error message: "RecurDyn Solver Lockup" (This message comes if there are any redundant constraints)

I have found that while giving joints I have put one un necessary joint. Even though it was working the same in NX10. (Gruebler count for the assembly is not zero in my case.)

I just need to know why it was working in NX 10 and not NX 11. I know the solution for the same i.e. deleting the unnecessary joint and making gruebler count zero. But we need reason for the cause