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ERROR:Flash Download failed - could not load file

hi everyone

I'm using keil 5 for stm32 i have problems fist while building my project these black windows comes for 1 second:

second when i want to load my project i have this error : 

ERROR:Flash Download failed - could not load file

'C:\Users\..............'

when i delete keil and install it again The problem solves but after few days i have the error again.i dont know what is wrong with it.

i'm also using stmcubemx to tranfer data to keil.