Sorry: TabError: inconsistent use of tabs and spaces in indentation

Index: prover9-mace4.py
--- prover9-mace4.py.orig
+++ prover9-mace4.py
@@ -635,7 +635,7 @@ class My_app(wx.App):
             path = os.path.join(image_dir(),'prover9-splash.gif')
             if not os.access(path, os.R_OK):
                 error_dialog('splash image %s not found' % path)
-	    else:
+            else:
                 splash = Splash_screen(path)
                 splash.Show(True)
                 time.sleep(1)
@@ -643,7 +643,7 @@ class My_app(wx.App):
 
         frame.Show(True)
     
-	# info_dialog(path_info())
+        # info_dialog(path_info())
     
         return True