step 1) once we try to configure any flow, plugin will generate an Xid and map it to the flow before sending to the switch.
step 2) after switch receive it will process the OF message
step 3) Incase, If any error Occurs in the Switch for invalid flow( ex: flow having an Instruction goto group which does not exist in switch) then switch will throws the Error Message with the same Xid.
step 4) Once plugin receive the Error Message It will try to process the message
step 5) but In AbstractErrorTranslator class I am receiving invalid Xid from msg parameter.