Why can't I log into my POS app on Shopify?

[MrMisfitNola]

Okay, so basically I can't even log into the Shopify POS app. Every-time I attempt to log in, it prompts me to the next step which is, "Selecting a location to sell from." After selecting the location I am then asked to, "Chose my display mode." After choosing my display mode, "Can't access store" pops up. Underneath that is "The operation couldn't be completed.(MerchantKit.StartupTaskError error 0.) I've tried to follow the steps from
"Troubleshooting the Shopify POS app" but I get jammed up every-time at the "Resync Shopify POS with your Shopify admin" step. What should I do?