The script in the library can be repaired by changing the function declaration and the execute method (the this.ClearHook may also need to be modified)

function TransferSubscriptionsService()
{
this.Request = null;
this.Response = null;
this.ServiceResult = null;
this.ExternalFunction = null; // reference to an external function
this.Name = "TransferSubscriptions";
this.Event = Identifier.TransferSubscriptionsResponse;

 // Injects errors into the response stream
// NOTE TO SELF: add more parameters for injecting into response parameters
this.Execute = function( args )
{
    print( "*** " + this.Name + " ***" );
    // setup the injection parameters
    if(isDefined (args.ServiceResult)) TransferSubscriptionsHelper.ServiceResult = args.ServiceResult;

    if( isDefined( args.ExternalFunction ) ) {
        TransferSubscriptionsHelper.ExternalFunction = args.ExternalFunction;
        print( "External function stored, ready for use with " + Name + " injection." );
    }

    // detach any existing hook, and re-attach the new one
    removeHook(TransferSubscriptionsHelper.Event );
    addHook( TransferSubscriptionsHelper.Event, TransferSubscriptionsHelper.ServiceResponseHandler );
};