fix Param calling in API

jedi/api/__init__.py

@@ -491,7 +491,7 @@ class Script(object):
             origins = cache.cache_call_signatures(_callable, user_stmt)
         debug.speed('func_call followed')
 
-        return [classes.CallDef(o, index, call) for o in origins
+        return [classes.CallDef(self._evaluator, o, index, call) for o in origins
                 if o.isinstance(er.Function, er.Instance, er.Class)
                 or isinstance(o, compiled.CompiledObject) and o.type() != 'module']