Meaning: Every load must belong to a load case. For some reason, this load is no longer assigned to a load case. The most likely cause is that the load case to which this load was assigned was deleted.
Recovery:
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Click Select .
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Set the Locate Filter to Loads.
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Select the load that is in error.
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Select another load case for the load. You can create new load cases by using New Load Case in the Structural Analysis task.