I executed code in my target board overnight under control of Keil uVision 4.54 Debugger. In the morning code wasn't running. It was stopped in the first instruction of main(). uVision command window displayed "internal DLL error". My guess is there isn't problem with my software or target board. Maybe due to power surge or some other reason uVision went into strange mode.
Why is "internal DLL error" occurring ?