Meaning: The base plate connection was expecting two end ports for placement, but the input count was not two. This is a software failure.
Recovery:
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Open the Structure task.
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Click Select .
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Set the Locate Filter to Member Assembly Connections.
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Select the assembly connection in error, and click Delete .
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Select Place Assembly Connection .
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Clear the By Rule option.
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From the Type box, select More, then Member End Assembly Connection, and then Base Plate Assembly Connection.
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Select the Base Plate Assembly connection to use from the list.
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Click OK.
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Select the frame connection at the end of the member.
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Click Finish.