有人可以帮我解决错误吗？ 我试图安装let加密 但当我做＆＃34;状态httpd.service＆＃34;发生此错误
httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Mon 2018-05-07 10:32:15 CST; 5min ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 21861 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
Process: 21859 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
Main PID: 21859 (code=exited, status=1/FAILURE)
May 07 10:32:15 JobSmile httpd[21859]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.24.141.99. Set the 'ServerName' directive globally to suppress this message
May 07 10:32:15 JobSmile httpd[21859]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
May 07 10:32:15 JobSmile httpd[21859]: no listening sockets available, shutting down
May 07 10:32:15 JobSmile httpd[21859]: AH00015: Unable to open logs
May 07 10:32:15 JobSmile systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
May 07 10:32:15 JobSmile kill[21861]: kill: cannot find process ""
May 07 10:32:15 JobSmile systemd[1]: httpd.service: control process exited, code=exited status=1
May 07 10:32:15 JobSmile systemd[1]: Failed to start The Apache HTTP Server.
May 07 10:32:15 JobSmile systemd[1]: Unit httpd.service entered failed state.
May 07 10:32:15 JobSmile systemd[1]: httpd.service failed.