--- /usr/lib64/python2.7/site-packages/calculate/lib/datavars.py.orig	2021-03-05 12:24:03.567599408 +0300
+++ /usr/lib64/python2.7/site-packages/calculate/lib/datavars.py	2021-03-05 12:24:10.038598855 +0300
@@ -1273,8 +1273,8 @@
         return section
 
     def raiseVariableNotFound(self, varname, *args, **kwargs):
-        #import traceback
-        #traceback.print_stack()
+        import traceback
+        traceback.print_stack()
         #print "Variable not found:", varname
         raise DataVarsError(_("Variable %s not found") % varname)