I am now conducting a sequential load step analysis. First, in the first load step, I need to constrain the 6-degree-of-freedom of the inner surface of the structure and apply the corresponding load. Then, in the second load step, I need to use RBE2 to couple the nodes on the aforementioned inner surface to a single point and apply a concentrated force at this coupled point. However, after starting the analysis and calculation, an error message "*** error # 2933 ***" is displayed. How can I resolve this issue?
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