Update usbBrickIO.m

source/usbBrickIO.m

@@ -136,7 +136,7 @@ classdef usbBrickIO < BrickIO
                             'likely cause is another EV3 object that is already ' ...
                             'connected to the physical brick. Call ' ... 
                             '"killAllConnections" using the EV3 object to disconnect' ...
-                            ' all other existing EV3 objects.'];
+                            ' all existing EV3 objects.'];
                     id = [ID(), ':', 'CommError'];
                     throw(MException(id, msg));
                 else