ColdFusion · Exception
What does Expression: expression evaluation failure, commonly UndefinedElementException mean in ColdFusion?
An expression could not be evaluated, most often from referencing an array index or struct key that does not exist. The underlying Java exception is typically coldfusion.runtime.UndefinedElementException, and the error message names the specific element ColdFusion could not find.
An expression could not be evaluated, most often from referencing an array index or struct key that does not exist. The underlying Java exception is typically coldfusion.runtime.UndefinedElementException, and the error message names the specific element ColdFusion could not find.
Read the stack trace for the actual function and line number involved rather than only the top-level message, since the generic wording rarely names the real cause on its own. Guard the access with ArrayLen() or StructKeyExists() before referencing an element that may not be present.