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REP-661: Invalid button source. You must specify a source file.

Cause:

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

Action:

Check to make sure you specified a source file for your button action, and, if so, make sure it is either sound, video, or image.

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