Problem with PWM in COAP simple client

Question

Hello, I am trying to use PWM in the simple coap client example. Unfortunately the PWM is not working, I do not get any signal on the output pins. If I remove the line with thread_instance_init(); then the PWM works. I only added the following function to the simple coap client example in nRF5_SDK_for_Thread_and_Zigbee_2.0.0_29775ac: 
 APP_PWM_INSTANCE(PWM1,2); 
 APP_PWM_INSTANCE(PWM2,3); 
 APP_PWM_INSTANCE(PWM3,4); // Create the instance "PWM1" using TIMER1.


 void init_pwm(void)
 {
 ret_code_t err_code;

 /* 1-channel PWM, 200Hz, output on DK LED pins. */
 app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(PWM_PERIOD, LED_1);
 app_pwm_config_t pwm2_cfg = APP_PWM_DEFAULT_CONFIG_1CH(PWM_PERIOD, LED_2);
 app_pwm_config_t pwm3_cfg = APP_PWM_DEFAULT_CONFIG_1CH(PWM_PERIOD, LED_3);
 

 /* Initialize and enable PWM. */
 err_code = app_pwm_init(&PWM1,&pwm1_cfg,pwm_ready_callback);
 APP_ERROR_CHECK(err_code);
 err_code = app_pwm_init(&PWM2,&pwm2_cfg,pwm_ready_callback);
 APP_ERROR_CHECK(err_code);
 err_code = app_pwm_init(&PWM3,&pwm3_cfg,pwm_ready_callback);
 APP_ERROR_CHECK(err_code);
 
 app_pwm_enable(&PWM1);
 app_pwm_enable(&PWM2);
 app_pwm_enable(&PWM3);
 
 while (app_pwm_channel_duty_set(&PWM1, 0, 50) == NRF_ERROR_BUSY);
 while (app_pwm_channel_duty_set(&PWM2, 0, 50) == NRF_ERROR_BUSY);
 while (app_pwm_channel_duty_set(&PWM3, 0, 50) == NRF_ERROR_BUSY);
 } 
 and here the main: 
 int main(int argc, char * argv[])
 {
 log_init();
 scheduler_init();
 timer_init();


 
 thread_instance_init();
 thread_coap_init();
 thread_bsp_init();
 
 
 
 timers_start();
 
 init_pwm();

 
 while (true)
 {
 thread_process();
 app_sched_execute();
 
 if (NRF_LOG_PROCESS() == false)
 {
 thread_sleep();
 }
 }
 } 
 
 I think my problem could be related to the following post: 
 https://devzone.nordicsemi.com/f/nordic-q-a/45816/pwm-conflict-with-freertos-thread-example Doing I am something wrong? Thanks in advance Thomas