This error occurs when one or both of the operands that form thetype arithmetic expression are of a type that is not allowed to be multiplied.

Example 1
In the following example, one of the operands in the arithmetic expression is a string, for arithmetic operations are not allowed.

Solution:

Changing the string, to the variable , corrects this error.

Example 2

In the following example, a space between and the left parenthesis implies multiplication between the two, which causes an error.

Solution:

Removing the space between and the left parenthesis corrects this error.

arithmetic, binary infix operators in Maple, type