init_TcpNet (); problem

Hi
I'm trying to run this example : C:\Keil\ARM\Boards\Keil\MCBSTM32C\RL\TCPnet\LEDClient
This example compile correctly but when it's programmed on board ,
it stuck on this command:

init_TcpNet();

if i turn one LED before this command , LED will turn on but if i turn one LED after this command LED won't turn on.
I'll be very tankful if any body tell me why this error happens and how it will be fixed.

best regard...
Hamid.

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