Cause
This error occurs if the input contains a pair of operands that are not compatible for the operation that is being performed; for example, it is invalid to add a
For a complete list of primitive type compatibility rules in JADE, see
Action
Delete the invalid expression, or modify the operator or the operands to make the expression valid.
In some cases, it may be possible to type cast one or other of the operands in order to produce a valid expression.