read information from plc to pc using c++

[Михаил Рогушков]

Hello, I used one of the sample from your webcite(http://infosys.beckhoff.com/content/1033/tcsample_vc/html/tcadsdll_api_cpp_sample17.htm?id=18610). When i read information from PLC, I get an error when calling AdsSyncReadWriteReq (see picture). Could you tell me what's wrong or what this error means?  

I used port, indexGroup and indexOffset from twincat. 

 

Twincat is up and running with the controller