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lpc17xx_rtc.o error

Hi
I want to use rtc in cmsis but I faced with this error
would you please help me
linking...
flash_fs.axf: Error: L6218E: Undefined symbol CLKPWR_ConfigPPWR (referred from lpc17xx_rtc.o).
flash_fs.axf: Error: L6218E: Undefined symbol check_failed (referred from lpc17xx_rtc.o).

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