rpc response data file aa...aa cannot be opened. error number=bbb

aa...aa: rpc response data file name (string of up to 255 characters)

bbb: Error number (errno of the open system call)

S: Stops the opening of this file and waits for input of a file name.

O: Remove the cause of the error according to the error number then enter a valid file name.

To stop the test, enter the end command.