You tried to change one or more layout objects to the same size, but the result of such an operation would have violated container constraints (that is, enlarged a field beyond its enclosing frame).
Action:
Select Edit--\>Undo to ensure your layout is the same as before the attempted operation. Then, you can either resize or reposition the container in question to enable you to perform the operation, or do nothing.
Note: For help on other error messages, see Finding error message help.
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