Get Post to Publish on Facebook

I cannot get my post to publish on my fanpage. I have checked FB Publishing in Screen Options. I check the box "I want to Publish this on Facebook." I enter a title under Publish on Facebook with a Different Title. I am signed into Facebook under my user name, not my fanpage name. I provide permissions, if needed. I publish to the wall of my fanpage. I click update. I get an error message that my post failed to publish on facebook. What am I doing wrong? (I do not want to publish all posts to facebook. I just want to post, sometimes, individual posts). Thanks.