unary operator expected

This error message typically occurs when a unary operator (an operator that operates on a single operand) is expected, but not found in the expression.

For example, in the following code snippet, the unary operator "-" is missing before the variable "x":

y = x + 5;

To fix this error, we need to add the unary operator "-" before the variable "x":

y = -x + 5;