Need Access Log and Error Log Have Same Format

I have a script that reads the access_log files and counts how many times an ip has accessed the site.  This works great and helps me to find bots I want to remove.  My question is, how do I get the access files and error log files to look the same?

I use a vhosts.conf file and in one of the virtual directories we have the following:

<VirtualHost 172.31.8.214:80>
        ServerName www.theherbsplace.com
        ServerAlias theherbsplace.com
        DocumentRoot /data/web/theherbsplace.com

        ErrorLog /data/log/php_errors_thp.log
        CustomLog /data/log/access_thp.log combined

        RewriteEngine On

<Directory /data/web/theherbsplace.com/>
     Require all granted
  </Directory>
</VirtualHost>

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When I add the word combined to the error log format line I get the following error:

AH00526: Syntax error on line 7 of /etc/httpd/conf.d/vhosts.conf:
ErrorLog takes one argument, The filename of the error log

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The format of the access_log is the one I want the errors log to follow.

So, how can I get the log format the same on both?  This is because it gives me the information I need and also will permit the script to read the error logs too.

Thanks,