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'Step' and 'Step Over' doesn't work while debugging

Hi,

i am new with Keil and STM32F407VG. I tried to run a simple code (blinking 4 leds). And it worked with no problem. Afterwards, i tried to learn some simple debugging basics.

And I can't reach breakpoint when i press 'Run'. 

Here is my try: https://imgur.com/a/gjC8rQq