[an error occurred while processing this directive]

So I had this message and was looking around what could have been the problem here.
Finally I found out it was the setting of my .htaccess file that was missing a certain code.
This code:

<IfModule mod_security.c> 
   SecFilterEngine Off 
</IfModule>

If I put this at the bottom of my .htaccess file it all worked well, the only question that arises here is: is my site still secure?
I hope this is help to anyone who's encountering this problem.
Please feel free to comment as I am not a code guru so it might be totally wrong to do so in terms of security holes and such.
Cheers !