Question about the apache server ?? Help !!

Question about the apache server ?? Help !! -- Linux general technology-Linux technology and application information. For details, refer to the following section. It was good at the beginning. Finally, I modified httpd. conf and restarted it:
[Root @ tangkunyin ~] # Service httpd start
Starting httpd (via systemctl): Job failed. See system logs and 'systemctl status' for details.
[Failed]
[Root @ tangkunyin ~] # Systemctl -- failed
UNIT LOAD ACTIVE SUB JOB DESCRIPTION
Httpd. service loaded 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.

How can this problem be solved ??