Maximize::consf Minimize::consf Reduce`Infimum::consf Reduce`Supremum::consf

Details

This message is generated when an expression listed after the objective function is not an equation, inequality, or domain specification.
Off[message] switches off the message; On[message] switches it on. For example: Off[Maximize::consf].

An error occurs because the objective function is expected to be the first element in the first argument of Minimize:

This shows a valid use of Minimize:

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