I have the same problem and still can't fix it.
I've been following a tutorial which took me through the exact same steps as the OP and every screenshot he posted matches the steps I went through near perfectly. However I have now decompiled the workspace and refreshed gradle using the blue arrow buttons close to 30 times, testing different settings from various other online suggestions between each attempt. Nothing I do seems to make any difference, but I'm not a coder so not sure how to better locate exactly what's causing the issue. Can anyone help?
Thanks in advance!