Preview window won't play and video won't export

Yesterday, I was able to work in Premiere Pro Beta all morning on a video and then suddenly around 3pm it started having issues. My video won't play in the preview window and freezes up. I can move my curser in the timeline, but the preview window remains frozen and the curser doesn't move in the timeline. I can render the video, but it still doesn't play. I tried exporting through premiere, through media encoder and tried quick export and it won't export. Through quick export in premiere, I got a message with this error. 

Error compiling movie. 

Export Error

Unable to create audio renderer.

Writing with exporter: H.264

Writing file type: H264

Around timecode: 00:00:00:00

Component: H264 of type Exporter

Selector: 9

Error code: 6

I've cleared my caches, but that didn't seem to work. Can someone please help! It's got to be an update issue, but because I saved it as the newest update the project won't open in previous versions. Anyone else run into this problem? Anyone have suggestions?!