Not Acceptable

This is a bit wierd. I was blogging when i came across this error :
Not Acceptable
An appropriate representation of the requested resource /blog/wp-admin/post.php could not be found on this server.

this is the first time i came across this kind of error and so i cut and pasted my post line by line to see if it would work. To my surprise, i narrowed it down to this line:
You will realise that its quite a squeeze when you insert into an adaptor.

Then i narrowed it down further to single words
and found that its the conbination of words “insert into” thats the problem.

Has anyone come across this same error?