diff --git a/reclass/datatypes/parameters.py b/reclass/datatypes/parameters.py
index a39324ea..7cc19cc4 100644
--- a/reclass/datatypes/parameters.py
+++ b/reclass/datatypes/parameters.py
@@ -272,5 +272,7 @@ def _interpolate_inner(self, path, refvalue):
             # finally, remove the reference from the occurrences cache
             del self._occurrences[path]
         except UndefinedVariableError as e:
+            print("Path:" + path)
+            print("Refvalue:" + refvalue)
             raise UndefinedVariableError(e.var, path)