• This message is generated by an assignment that does not contain a valid assignment tag.
  • The assignment tag is the symbol on the left-hand side of the assignment with which the rule created by the assignment will be associated.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[General::nosym].


Basic Examples  (1)

Attributes cannot be attached to a pattern expression:

This shows a valid assignment to the Attributes of a symbol: