ADOBE PREMIERE RUSH - NOT RESPONDING

I HAVE RECENTLY INSTALLED THE ADOBE PREMIERE RUSH FOR THE VIDEO EDITING AND AFTER HARDWORK OF 3-4 HOURS COMPLETED IT . WHEN I GO FOR THE EXPORT OPTION THE APP IS CRASHING AGAIN AND AGAIN , MY VIDEO IS STUCK AND NOW I WONT BE ABLE TO COMPLETE MY PROJECT. THERE ARE MANY VIDEO EDITING APPS BUT DID NOT EXPECT THIS FROM ADOBE . KINLDY LOOK INTO IT .ITS STUCK THERE FOR ATLEAST 20 MINUTES AND THE OVERALL SIZE OF VIDEO IS LESS THAN 20 MB.