Does this help?? This is what is in the log straight away
Oct 21 22:21:24 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:25 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:26 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:27 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:28 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:29 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:30 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:31 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:32 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:33 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:34 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:35 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:36 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:37 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)
Oct 21 22:21:38 Tower emhttpd: error: get_key_info, 577: Invalid argument (22): get_message: /boot/config/BTRS.key (-3)