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Does the user have their Private Messages turned off? Or perhaps you've been blocked from sending that user PMs.
I dunno ~Nyā..
I'm able to receive messages from him just fine....
This wouldn't prevent it. In the user page there is an option to make someone your friend. Right under that is an option to put them on the ignore list. Accidents happen. Maybe they did an oopsie when trying to make you their friend.
Have them click on your username. It will bring up your user page. Over to the right in the Contact panel, there will be two larger buttons to click. The top one should say to remove you from the firends list. The bottom one should say to ignore you. Check and see if it says to remove you from the Ignore list. If it says that, just have them click it and it will fix.
Point that user to this post. Send them this link.