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Cortex M0 Nucleo F030r8 debugging error 57

I am using the keil uVision V5.25.2.0 to code the STM32F030R8tX micro controller and the board is Nucleo-F030R8. I have successfully flashed the code in the board, but the command window shows an "cannot access memory error 57: illegal address (0x08000000)".

What could be the problem here?