operation needs l-value
An expression that does not evaluate to an l-value was specified for an operation that requires an l-value.
An l-value (so called because it appears on the left side of an assignment statement) is an expression that refers to a memory location.
For example, buffer[count] is a valid l-value because it points to a specific memory location. The logical comparison zed != 0 is not a valid l-value because it evaluates to TRUE or FALSE, not to a memory address.
This error is identical to CAN0024.