This wallet does not contain any accounts.
Which means it's created with Settings/Wallet "NEW WALLET" - it's just container for key import, so can't be funded before key is imported(?):
"In order to import keys, you first need to create a wallet to contain the keys".
What came to my mind is:
1.Are you trying to import your backup by using "NEW WALLET" button?
If so, you should use [Settings/Restore-Import/Restore from a backup file] instead.
Import all your backups into wallet with account, one by one. All of them.
Next go under Settings/Wallet. You should have list of imported wallets under "ACTIVE WALLET" and you can switch between them.
2. Are you created wallet by using "NEW WALLET", then made backup, and now trying to import?
It's empty, always was.