https://devzone.nordicsemi.com/f/nordic-q-a/89850/error-4-nrf_error_no_mem-app_sched_event_putHi all: SDK17.1.0 softdevice:s112 example:ble_app_hids_keyboard I add a lot of function in my project ,including gzll, i2c,timer1 ,app timer ,rtc ,flash read/write... but it shows the error as below &lt;error&gt; app: ERROR 4 [NRF_ERROR_NO_MEMen-USTelligent Community 13Wed, 13 Jul 2022 08:27:03 GMThttps://devzone.nordicsemi.com/thread/376724?ContentTypeID=1Wed, 13 Jul 2022 08:27:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b3683184-9701-410a-8cdf-a8ca5eee039aKenneth<p>Only that it will take up RAM&nbsp;and that the execution is delayed.</p> <p>Kenneth</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/376661?ContentTypeID=1Tue, 12 Jul 2022 16:36:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75d679e6-7a26-4e40-bf7f-a161cbfbb118joe<p>are there any side effects of increasing&nbsp;&nbsp;<span>SCHED_QUEUE_SIZE?</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/376446?ContentTypeID=1Mon, 11 Jul 2022 13:28:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1bdfb9f3-e8cf-4301-9904-ba3eaf6e1a7bKenneth<p>Sounds to me that you are calling&nbsp;app_sched_event_put() must faster than you are able to call&nbsp;app_sched_execute() in your while loop in main().</p> <p>You can try to consider increasing&nbsp;<span>SCHED_QUEUE_SIZE a bit more, but if that doesn&#39;t help, then you should look into how frequently you are calling your app_timer, and try to reduce how often it&#39;s called, or try to look into what may be preventing&nbsp;app_sched_execute() from being called frequently enough.</span></p> <p><span>Kenneth</span></p><div style="clear:both;"></div>