Omnet++ 4.6 stop simulating during runtime

[Abir]

Dear
i try to simulate the program in omnet++ 4.6 and try to develop my MAC code. when i try to simulate the program, it shows "simulating sfmac (0%)" and after a long time waiting it still in the same situation "simulating sfmac (0%)" at the bottom site of the gui.
i reinstall the omnet++ 4.6 program but it works for first time and again arise the same problem.

i use windows 8 pro operating system , 8gb ram as well as use windows defender and the defender always updated.

need help please.

[Maria Nelago Kanyama]

I want to create a topology from a  .txt file on my deskop. I used the "import topology from a text file" in INET but its just giving me an error "error, file not found".

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