diff --git a/script/RobotSC.py b/script/RobotSC.py
index dcdb408..d734d5b 100644
--- a/script/RobotSC.py
+++ b/script/RobotSC.py
@@ -32,7 +32,7 @@ class RobotSC(RobotTCP):
         #TODO: Check safe position
         RobotTCP.start_task(self, program, *args,  **kwargs)
 
-    def stop_task(self, program, *args,  **kwargs):
+    def stop_task(self):
         RobotTCP.stop_task()
         #TODO: Restore safe position            
                 
diff --git a/script/RobotTCP.py b/script/RobotTCP.py
index 2492fda..809c84f 100644
--- a/script/RobotTCP.py
+++ b/script/RobotTCP.py
@@ -381,11 +381,11 @@ class RobotTCP(TcpDevice, Stoppable):
     def start_task(self, program, *args,  **kwargs):
         for task in (self.high_level_tasks + [program]):
             if self.get_task_status(task)[0]>=0:
-                raise Exception("Cannot start program - ongoing high-level task: " + task)
+                raise Exception("Ongoing high-level task: " + task)
         self.current_task = program
         self.task_create(program, *args, **kwargs)
 
-    def stop_task(self, program, *args,  **kwargs):
+    def stop_task(self):
         for task in (self.high_level_tasks + [program]):
             if self.get_task_status(task)[0]>=0:
                 self.task_kill(task)