This error occurs when an object that is not a name is used where Maple expects a name.  This will occur when you make an assignment (using :=) and the left-hand side is not an assignable object or a sequence of assignable objects.  The same issue occurs when you use a nonassignable object as an index variable or in another place where a name is expected.

Example 1

The problem is that the left-hand side is a list.  It must be a name or a sequence of names.

Solution:  To make multiple assignments, use two assignment statements or put a sequence of names on the left-hand side.

Example 2

$\mathrm{I}$ is used to denote the imaginary unit ($\sqrt{-1}$) in Maple.  You cannot assign to this name or use it for an index variable.

Solution:  Use a different name.

Example 3

In this procedure, the evaln modifier expects a parameter that evaluates to a name.

Solution: Call the myProcedure with a parameter that is assignable.