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Link: Added: This issue depends GUVNOR-252
This happened because a rule has called methods that are no longer supported. Workaround: It was allowed to call particular methods on lists for example, like size(), iterator() and this has been removed, since it did not make sense. These methods have been replaced with other (add(), clear()) ones. So to call any other methods, being not part of that provided list, you need to write them as free form drl.