Stuck on the screen after clicking "Receive money"

Why is it that when i tried to click on payment received it always stops and asking for received in and cant match any category.

You need to create some bank account or cash account under Bank accounts or Cash accounts tabs first.

Thanks Lubos for the answer.

One more thing, does it matter if I put my sale in sale category or it must be in sale at inventory. Whats the difference?

Does your business maintain physical inventory? What do you sell?