warning message typo

mbtrack2/tracking/beam_ion_effects.py

@@ -431,7 +431,7 @@ class BeamIonElement(Element):
 
         if self.ion_beam_monitor_name:
             warnings.warn(
-                'BeamIonMonitor.ion_beam_monitor_name.close() should be called at the end of tracking',
+                'BeamIonMonitor.beam_monitor.close() should be called at the end of tracking',
                 UserWarning,
                 stacklevel=2)
             self.beam_monitor = IonMonitor(