RCDC ERROR WHILE DESIGNING BEAM (STAAD PRO CONNECT EDITION UPDATE 5)

During design of beam in rcdc,if i put a check of crack width the software will not design and it gives a message written "Cannot find column [StAstTop] but if i dont check for crack width the software works perfectly.Need a help on this problem because this problem does not occur in design of column, only in beams.

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