Cannot access memory of LPC1769

Hi,

I was playing around with the system_LPC17xx.c and changed the osciallator from "Main oscillator" to "RTC oscillator". The device did not boot, so I set it back to "Main oscillator", but now I get the message "Cannot access memory". Did I break something?

Cannot access Memory (@ 0x00000000, Write, Acc Size: 4 Byte)

I have  ULINK2 ME in case that is relevant.

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