A missingMethodException generally means that the parameters you have used for a Groovy method do not match any of the possible acceptable methods. As an example, if a method has parameters like below:
method(TO, String, boolean)
method(TO, String, boolean, FailureHandling)
and you put the parameters like:
method(TO, String, int)
then the parameters of the lower method (TO, String, int) does not match either of the upper (and acceptable) parameters–giving a missingMethodException. More information can be found in other forum answers, like below.
If you show your code, then we can give you more specific information.