PWM library showing error ( nrf_gpiote_task_config)undefined symbol

[MARTIN FR]

Hello Everyone i have been trying to implement the pwm library from the GITHUB inorder to make the buzzer beep sound but after compilation it is showing these two errors so can anyone help to solve this errors and guide me how to make the buzzer beepw ith this pwm example library

._build\nrf51422_xxac_s110.axf: Error: L6218E: Undefined symbol nrf_gpiote_unconfig (referred f._build\nrf51422_xxac_s110.axf: Error: L6218E: Undefined symbol nrf_gpiote_task_config (referred from nrf_pwm.o).rom nrf_pwm.o).

[Ole Bauck]

You need to use the packs version for SDK 7. In “pack installer” (symbol far right in the lowest toolbar in Keil, see picture) install version 1.2.1 in NordicSemiconductor::nRF_Drivers. Then in “select software packs” (symbol next to “pack installer”) select to use version 1.2.1.

[MARTIN FR]

i am using the SDK version 9 zip folder what can i do inorder to use those functions in the Sdk 9?