If you do not have a file called Award.szs, you can download it from https://avsys.xyz/MKW/Award.szs

Open up Award.szs in brawlbox, and scroll down to wr.brres is. Right click wr.brres and hit replace.
When the file selection opens, click the new wr.brres in this folder and then save.

Make sure that your Award.szs is placed in your My Stuff folder after saving.