Working with multiple wallets in Bitcoin Core

Hi, I'm trying to work with multiple wallets with Bitcoin Core on regtest, for learning purposes.

I created 3 wallets like

Code:

bitcoin-cli -regtest createwallet "wallet1"
bitcoin-cli -regtest createwallet "wallet2"
bitcoin-cli -regtest createwallet "wallet3"

Now I want to unload/load wallets, but

Code:

bitcoin-cli -regtest loadwallet "wallet1"

gives me an error message:

Code:

error code: -4
error message:
Wallet file verification failed: Error loading wallet wallet1. Duplicate -wallet filename specified.

Depending on the path I give for "wallet1" I get various different errors, but nothing loads the wallet.

I understand that I can specify the wallet via the

Code:

-rpcwallet="walletname"

option. But for what purpose are the loadwallet/unloadwallet commands? How are they meant to be used?

Thanks.