when try to run in simulator app crashed,   Error connecting to the service protocol: failed to connect to http://127.0.0.1:57286/sb6cUtonpqc=/ 

Running Xcode build...                                                  
 └─Compiling, linking and signing...                         3.8s
Xcode build done.                                           18.1s
Error connecting to the service protocol: failed to connect to http://127.0.0.1:57286/sb6cUtonpqc=/