Received following error from ApexApplication. Any help on how to troubleshoot it will be really apprecited. 

Developer script exception from Online Trading Academy : 'et4ae5.etCallControl' : Dependent class is invalid and needs recompilation: Class et4ae5.SecureSettingsManager : Dependent class is invalid and needs recompilation: Class et4ae5.SObjectHelper ...

Failed to invoke future method 'public static void subscribeForTrackingAsync(String, String, String, String)' on class 'et4ae5.etCallControl' for job id '707f3000044cX7O'

caused by: line 24, column 26: Dependent class is invalid and needs recompilation:
Class et4ae5.SecureSettingsManager : Dependent class is invalid and needs recompilation:
Class et4ae5.SObjectHelper : Dependent class is invalid and needs recompilation:
Class et4ae5.SFDCDescribeInfoCache : Variable does not exist: fields

Hello there,

 

Im having trouble on how to create a listener of salesforce outbound message. Do you have a step-by-step lesson on how to create a salesforce outbound listener ? specially in java and php language ? Please help me.

 

Kind Regards,

 

John