You tried to create a matrix (using Tools--\>Create Matrix) without the proper objects selected in the Paper Layout editor. A matrix layout requires that at least one group have a repeat direction of Down and one have a repeat direction of Across.
Action:
Select two repeating frames--one Down, one Across--that overlap, then choose Arrange--\>Create Matrix.
Note: For help on other error messages, see Finding error message help.
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