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MSC ADAMS Linearization error

MSC ADAMS Linearization error

MSC ADAMS Linearization error

I am working in ADAMS/VIEW for vibration analysis. I am making human model. I used connectors for joints in human body, but I want to remove these connectors. But removing these connectors showing linearization error. How can I correct it?

ERROR: Linearization of the system can not be performed.
Number of equations is 617, number of variables is 617, rank is 614.
Possible causes could be:
1. An input variable appears in a level 1 constraint or motion.
2. A PSTATE variable defines a variable that can not be used to linearize the system.
ERROR: Simulation failure detected.
ERROR: Simulation failure detected.

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