https://devzone.nordicsemi.com/f/nordic-q-a/12530/keil-error-65Hi thank for reading with your kindness I used keil with nrfready_desktop_2_/* files when I clicked &quot;Start/Stop Debug Session&quot; with simulator in debugging session, It has said &quot;error 65 : access violation at 0xXXXXXXXX : no &#39;write&#39; permissionen-USTelligent Community 13Mon, 14 Mar 2016 12:57:34 GMThttps://devzone.nordicsemi.com/thread/47520?ContentTypeID=1Mon, 14 Mar 2016 12:57:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:97bcb825-2c37-4009-b794-874e8fbc32c2Hung Bui<p>Hi Park,</p> <p>Have you tried to test on an un-modified project ? (maybe download the nrfReady Desktop 2 zip file again ? ) In your Debug tab, you should have this (don&#39;t select the Simulator):</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/Capture14Mar.PNG" alt="image description" /></p><div style="clear:both;"></div>