Can't export Video

I can't export my film of about 15 seconds. The media encoder doesn't open and says swf file isn't supported if I open it myself and try draggin it in. The encoder to turn it into a MP4 isn't queuing anything either after various attemps at diffrent file formats. I have uninstalled and reinstalled both programs but nothing seems to be working. I've even copy and pasted my film into a new project and nothing changes. Hopfully i'm missing something simple it's always just worked strait away before.