MSC-student need help

[onder ameen]

Hello

  My O.S:  Win7, and has been tested on windows vista

omnet version: 4.1

        When I'am using "sendDirect()" function , the following error rases” no matching function for call to 'Node::sendDirect(cMessage*&, double, cModule*&,  cGate*)''.

Where Node is simple module.

 

I have problem when using string data type as parameter to function or when return string data type from function.

I attached a copy of code

I'll be thankful for any references about the simulator that you can  supply it to me

 

 

Thank you