fix order takes one argument, 'allow,deny', 'deny,allow', or 'mutual-failure', referer:

.htaccess error apache
order takes one argument, 'allow,deny', 'deny,allow', or 'mutual-failure', referer: http://localhost

If you are facing such problem you just need to make sure that after order you have a string without spaces.

The most common error (that I usually do) is to add a space after the comma

example of the wrong string: order allow, deny
example of the right string: order allow,deny