Micro C stops and does not resume

Many thanks for your fast reply Cris, I am grateful for your attention:)

However, I am afraid my problem is not solved. I debugged the program to check if the tasks are created well and the returned value was zero, so the problem is not here. Therefore, I resumed debugging the program and it stopped in the command OSStart(), it is to say, the code never reach tasks. I suppose I must have defined something badly about the micro c but I have no idea which the problem can be.

By the way, the timer is set to 1ms. If I am not wrong, this timer is used to control the delays and so 1ms is a proper value.

I hope this information is useful. If any tip comes into your head, let me know.

Many thanks! ;)