Both messages mean the landlord hasn't finished setting up their account to accept payments. The renter hasn't done anything wrong, and the payment can't go through until the landlord completes setup.
Renters
Let your landlord know they need to finish their PayRent payment application. Once they do, try your payment again, and check that any scheduled payments are still set up in your Wallet.
Landlords
Complete the application to accept payments. You'll need:
Your federal tax ID: your SSN if you're a sole proprietor, or your EIN for an LLC or other business
Your identity details
Your settlement bank account, connected through the bank login (Plaid) step
For step-by-step instructions, see How to Complete the application form to accept Payments on PayRent. If the bank asks for more documents during review, you'll be notified.