apache服务器的问题？？求助！！

开始都好好的，最后我修改了一下httpd.conf再重启就出现这了：
[root@tangkunyin ~]# service httpd start
Starting httpd (via systemctl): Job failed. See system logs and 'systemctl status' for details.
[失败]
[root@tangkunyin ~]# systemctl --failed
UNIT LOAD ACTIVE SUB JOB DESCRIPTION
httpd.service loaded failed failed LSB: start and stop Apache HTTP Server

LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
JOB = Pending job for the unit.

怎么解决阿？？