No video playback in preview; Error code 63

I switched to Resolve 15 Beta from Premiere Pro yesterday. After acquainting myself with the interface and changing all of my keyboard shortcuts in the program, I was learning how to render previews. As I preview my timeline footage, the audio will playback, but there is no video in the monitor.
Also, I am getting a message as I playback the footage that says "The GPU failed to perform image processing because of an error. Error Code: 63".
Keep in mind, this is the first time I've opened the program. I haven't applied any extravagant effects or import any composited files. I'm running a trial run with simple 1080p footage. I've used several different samples of video and audio, so I know it isn't corrupted files.
Thanks for your help.
Also, I am getting a message as I playback the footage that says "The GPU failed to perform image processing because of an error. Error Code: 63".
Keep in mind, this is the first time I've opened the program. I haven't applied any extravagant effects or import any composited files. I'm running a trial run with simple 1080p footage. I've used several different samples of video and audio, so I know it isn't corrupted files.
Thanks for your help.