HELP USING CMSIS USART DRIVER

I am trying to use CMSIS USART DRIVER API to use UART0 on my LPC1768. But whenever I try to build the project, I get the following error:
.\Objects\1.axf: Error: L6218E: Undefined symbol DRIVER_USART0 (referred from 1.o)

Can anyone please help me with it ?

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