@@ -0,0 +1,190 @@
+class InvalidPidFileError(Exception):%0A    %22%22%22 An exception when an invalid PID file is read.%22%22%22%0A%0Aclass PidFileExistsError(Exception):%0A    %22%22%22 An exception when a PID file already exists.%22%22%22%0A

Add exception classes.