Details

This message is generated for typeset input when an excess differential operator is found in the integrand.
Region integrals do not include the differential operator x. Instead, the variable of integration is specified in the underscript of ∫. If the integrand also includes a differential operator, this is an error.
Off[message] switches off the message; On[message] switches it on. For example: Off[Integrate::diffbody].

Examples

This input includes an underscripted integral sign as well as an extra differential operator; when this error occurs, the input is not evaluated:

Wolfram Language code: Underscript[∫, {θ}∈Interval[{0, 2Pi}]]Sqrt[Sin[θ]]ⅆθ

This is the correct input, which omits the θ:

Wolfram Language code: Underscript[∫, {θ}∈Interval[{0, 2Pi}]]Sqrt[Sin[θ]]

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