Details

This message is generated when the gradient of the objective function is zero to within numerical error at a point that is checked by the algorithm.
If the function has a minimum, this error can often be corrected by choosing different starting values, or by giving two starting values for each variable.
Off[message] switches off the message; On[message] switches it on. For example: Off[FindMinimum::fmgz].

Examples

The starting point corresponds to a saddle point:

Wolfram Language code: FindMinimum[1 + x ^ 2 - y ^ 2 + y ^ 4, {x, 0}, {y, 0}]

The minimum is computed without difficulty if different starting values are used:

Wolfram Language code: FindMinimum[1 + x ^ 2 - y ^ 2 + y ^ 4, {x, 0}, {y, 1}]

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