DSolve::alliv NDSolve::alliv NDSolveValue::alliv ParametricNDSolve::alliv ParametricNDSolveValue::alliv RSolve::alliv

Details

This message is generated when an unknown function is specified without dependence on all the independent variables.
Off[message] switches off the message; On[message] switches it on. For example: Off[DSolve::alliv].

The unknown function y in the second argument does not depend on the independent variable t:

Replace y[x] in the second argument by y[x,t]; then the example works:

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