Details

This message is generated when a constraint of the form Element[expr,Integers] is encountered, and the expression expr is not one of the variables.
Off[message] switches off the message; On[message] switches it on. For example: Off[NMinimize::belt].

Examples

An error occurs because the product 2x is not one of the variables:

This shows a valid use of NMinimize to minimize a function with the constraint that the variable be an integer:

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