Error, invalid terms in product: modp1(ConvertIn(6*x^10+9*x^9+5*x^8+x^7+10*x^6+3*x^5+5*x^4+4*x^3+10*x^2+7,x),11) - Maple Help

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Error, invalid terms in product

 Description For users of  Maple 15 and earlier versions: 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.

Examples

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 $a$, corrects this error.

 > $a\cdot b$
 ${a}{b}$ (2.1)

Example 2

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

 > $\mathrm{Az}≔.15:$
 >

Solution:

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

 >
 ${"O.K"}$ (2.2)