I have my freedom board(KL25Z128) without any oscillator connected to PTC1 and PTC3. I have found tutorials on "how to use RTC component with ERCLK32K, by connecting oscillator between PTC1 and PTC3". But i don't have crystal with me. So I have tried to take internal oscillator in component inspector settings. I have encountered an error " Not supported by hardware". I am attaching the screen shot of the error i have encountered. Help me in solving this issue.