For questions on interpreting existing (i.e. built-in) error messages of Mathematica that you have encountered, as well as writing and managing messages for your own functions. This involves issuing, querying, turning on and off and suppressing messages, assertions and other runtime code checks using functions like Message, Quiet, On, Off, Assert, Check, etc.

For non built-in error messages, failure reports and other faults displayed in dialog windows during runtime by third party applications please use the tag .

Useful links:

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