Details

This message is generated when Show is used with more than one argument and at least one of the arguments is not a valid graphics expression.
Off[message] switches off the message; On[message] switches it on. For example: Off[Show::gcomb].

Examples

An error occurs because Line is a graphics primitive rather than a graphics expression:

Wolfram Language code: Show[Line[{{0, 1}, {5, 2}}], Line[{{0, 0}, {5, 3}}]]

This shows valid graphics expressions in Show:

Wolfram Language code: Show[Graphics[Line[{{0, 1}, {5, 2}}]], Graphics[Line[{{0, 0}, {5, 3}}]]]

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