Quicktime Error -150

Hi, I have been using fcpx alot lately exporting videoes for youtube in 720p.

But now suddenly i get Quicktime Error -150 whenever i try to export either "Export with compressor settings" or "Send to compressor".

If I use "Send to compressor" It opens up Compressor 4, i put on destination and quality and submits the project. Then it start transcoding and it gives me the error!

Anyone who can help me with this?