To all of the people that are getting the error when posting -- Is this happening whenever you make just a WordPress post (meaning not an EasySMS "post") Is this happening with or without automatically SMS whenever a new post is made?
I'm just trying to figure out if this Plugin is salvageable in it's current form just as a way to manually post out updates. Is this issue just that you have to back out of the PHP error page whenever making new posts to your blog through WordPress each time?
It looks like support for this plugin has been discontinued by the developer.
On his contact page he says that he is not continuing it because of lack of financial support and invites someone to take it over.
Maybe some donations would get an update...not sure how you donate though...