按照阿里云的CA证书安装步骤弄完后出错不能启动Apache
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.

以下为错误日志：
Jan 31 17:07:56 iZto7tt2prh33eZ httpd: httpd: Syntax error on line 54 of /etc/httpd/conf/httpd.conf: Cannot load modules/mod_foo.so into server: /etc/httpd/modules/mod_foo.so: cannot open shared object file: No such file or directory
Jan 31 17:07:56 iZto7tt2prh33eZ systemd: httpd.service: main process exited, code=exited, status=1/FAILURE
Jan 31 17:07:56 iZto7tt2prh33eZ systemd: httpd.service: control process exited, code=exited status=1
Jan 31 17:07:56 iZto7tt2prh33eZ systemd: Unit httpd.service entered failed state.
Jan 31 17:07:56 iZto7tt2prh33eZ systemd: httpd.service failed.