I'm actually only able to upload if I use the tag dtube. Nothing else. In fact, if I try to use another tag, along with dtube as a tag, I am forced to reupload the video only using the tag 'dtube'. Even though I remove the other tags, I will continue to get the unknown error message every time I submit the video. That is, until I redo the entire thing, ensuring to use ONLY the dtube tag and nothing but the dtube tag. It cannot be an empty field. It cannot contain anything other than 'dtube'.