Please confirm you AMD graphics card is running at version 17.12.1 or higher first. Here is where you can download the latest AMD graphics card driver if needed. Now there are other reasons why you may encounter an RDL error, so be sure to also check this troubleshooting and if everything there is not helping, then considering starting a Blizzard Support Ticket and be sure to include your PC system files in the web ticket form so that Blizzard can quickly find any problems with your specific PC. Cheers.