I can't get 4 channel PWM output

I can't get 4 channel PWM outputhttps://devzone.nordicsemi.com/f/nordic-q-a/28603/i-can-t-get-4-channel-pwm-outputhi ： I want 4 channel PWM output, the following code doesn't work, I want to know where is wrong #include <stdbool.h> #include <stdint.h> #include "nrf.h" #include "app_error.h" #include "bsp.h" #include "nrf_delay.h" #include "app_pwm.h" en-USTelligent Community 13Tue, 19 Dec 2017 15:56:33 GMTRE: I can't get 4 channel PWM outputhttps://devzone.nordicsemi.com/thread/113356?ContentTypeID=1Tue, 19 Dec 2017 15:56:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2362bdc6-88e3-4429-94a9-8a34e3436a04Joakim Jakobsen<p>Hi NRF CODER!<br /> Could you tell me which SDK and what device you are working with?<br /> Best regards.</p><div style="clear:both;"></div>