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REP-660: Invalid button source. You must select a column.

Cause:

You selected Multimedia Column as the source for your button action, then either did not specify a source column, or specified an invalid source column.

Action:

Check to make sure you specified a source column for your button action, and, if so, make sure it contains either sounds, video, or images.

Note:  For help on other error messages, see Finding error message help.