Class Failure

source code

               object --+                
                        |                
 exceptions.BaseException --+            
                            |            
         exceptions.Exception --+        
                                |        
roslib.exceptions.ROSLibException --+    
                                    |    
                   ROSMasterException --+
                                        |
                                       Failure

Call to Master failed. This generally indicates an internal error in the Master and that the Master may be in an inconsistent state.