The YouTube uploader is not working. What can be the reason?

The reason can be either a missing YouTube Video Channel in your YouTube account and/or that your account settings on YouTube does not allow you to upload videos longer than 15 minutes.

How to create a video channel in your YouTube account:

Please login to your YouTube account, go to your video manager and click on "Create a channel".  

How to enable video uploads longer than 15 minutes:

Click on "Channel Settings" and click on the button "enable" for the category "longer videos".

If you created a channel and enabled the feature for uploading longer videos, you will be able to connect your YouTube account with your Lightcast account and publish your videos - uploaded to your Lightcast account - to your YouTube channel.