I recently started playing Skyrim again & I had noticed a sword I was using is gone. So I went to open the Creation Kit & each time I try to load up dawnguard I get an Error and it want me to retry abort or ignore the error.
here is a picture of what it tells me exactly.
http://i76.photobucket.com/albums/j10/ultimaomegacloud/ErrorwithCreationKit_zps19d09168.jpg