I keep getting an error message when i try to export a 21 minute movie, the message comes at 100%. I split the movie in half and can make two parts and they export fine, but again when i try to link them in new project i get an errror message at 100%. im running windows 7, lots of ram. i7 chipset, excellent graphics card. whats going on? its elements 2020. oh ive restarted my computer and still no joy.