*** error 65: access violation at 0x40023800 : no 'read' permission

i'm nagendra murthy, i'm developing code for STM32F427VITboard for blinking the led using keil. i'm facing the problem in solving this error *** error 65: access violation at 0x40023800 : no 'read' permission. i have connected the LED to port B pin no 14 and 15. program is running without errora and warning. but when i debug it. it is showing error mentioned above.. please help me..

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