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REP-3100: Matrix must include at least 1 Down and 1 Across repeating frame.

Cause:

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.

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