Details

This message is generated when FindMaximum is used with Method->"LevenbergMarquardt", and the first argument is not given as a sum of squares.
Off[message] switches off the message; On[message] switches it on. For example: Off[FindMaximum::notlm].

Examples

The first argument has an incorrect form for use with Method->"LevenbergMarquardt":

Wolfram Language code: FindMaximum[x ^ 2 - 4x - (y - 3) ^ 2, {x, 1}, {y, 1}, Method -> "LevenbergMarquardt"]

This shows a valid objective function for use with Method->LevenbergMarquardt:

Wolfram Language code: FindMaximum[4 - (x - 2) ^ 2 - (y - 3) ^ 2, {x, 1}, {y, 1}, Method -> "LevenbergMarquardt"]

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