Can you please explain what you mean by “I made a new one”?. The litecoin testnet page has its own address (see the “wallet address” field). You can test withdrawing to that address. Or, if you have created a new address in some other litecoin testnet wallet that will work too. You cannot withdraw to another address generated by the same plugin. If you do, then your withdrawal will be automatically changed to an internal transfer.
Did you check the things I asked you in the previous post? What did you find?