There is no overloaded version of "SendMsg" that can be called with these arguments

I am upgrading a project from Delphi 2006 to Delphi XE2 and encountered a compilation error There is no overloaded version of "SendMsg" that can be called with these arguments. This is the code where the problem is.

procedure TMessageComms.UpgradeError(Msg: String);
begin
  FConnection.SendMsg(cUpgradeError, Msg, FConnection.GetNextMsgID);
end;

      

        
        
        
      

    

The SendMsg method looks like this.

procedure SendMsg(ACommand, AParamStr : String; AMsgID : Integer); overload;

procedure TMsgConnection.SendMsg(ACommand, AParamStr: String; AMsgID: Integer);
begin
  // construct message
  // send message
end;

      

        
        
        
      

    

cUpgradeError is const declared this way.

 cUpgradeError = 'UpgradeError';

      

        
        
        
      

    

And this is the GetNextMsgID function that returns Integer.

function TMsgConnection.GetNextMsgID: Integer;
begin
  Inc(FLastMsgID);
  Result := FLastMsgID;
end;

      

        
        
        
      

    

All parameters seem valid to me. I was able to narrow it down to the point that it has to do with the GetNextMsgID function, but not sure what. If I pass the value returned from the function to Integer, then it compiles fine, but I don't understand why I need it.