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title: Message detail for PLMC27
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---

Detail for Marionette Collective message PLMC27
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Example Message
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    Formats supplied to aggregation functions must have a :format key

Additional Information
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DDL aggregate functions can take a custom format as in the example below:

    aggregate average(:total_resources, :format => "Average: %d")

This error indicate that the :format above could not be correctly parsed.