some error log:AUTHCACHE Cannot get random stream from TMM

i can't get explanation on F5 web site, is there anyone can help me? ----------------* /var/log/httpd/httpd_errors ----------------*

Mar 2 07:33:01 1600 httpd[23972]: [error] jk2_init() Can't find child 23972 in scoreboard Mar 2 07:33:01 1600 httpd[23972]: [error] mod_jk child init 1 -2 Mar 2 12:39:09 1600 httpd[28261]: [error] jk2_init() Can't find child 28261 in scoreboard Mar 2 12:39:09 1600 httpd[28261]: [error] mod_jk child init 1 -2 Mar 2 13:04:40 1600 httpd[28637]: [error] mod_jk child init 1 0 Mar 2 14:46:42 1600 httpd[28637]: [error] [client 10.3.69.232] AUTHCACHE Cannot get random stream from TMM Mar 2 14:46:42 1600 httpd[28261]: [error] [client 10.3.69.232] no acceptable variant: /usr/local/www/error/HTTP_UNAUTHORIZED.html.var, referer: https://10.2.185.82/tmui/Control/jspmap/tmui/overview/welcome/introduction.jsp Mar 2 16:35:56 1600 httpd[28261]: [error] [client 10.3.69.232] no acceptable variant: /usr/local/www/error/HTTP_UNAUTHORIZED.html.var, referer: https://10.2.185.82/tmui/Control/jspmap/tmui/overview/welcome/introduction.jsp Mar 2 16:35:56 1600 httpd[31589]: [error] jk2_init() Can't find child 31589 in scoreboard Mar 2 16:35:56 1600 httpd[31589]: [error] mod_jk child init 1 -2