Transaction invalid: some outputs that it attempts to spend have been already spent or are no longer valid.
The fund you were trying to send was spent in another transaction using a higher fee.
What's the wallet you are using?
Do you own the private key of the address?
There are two possibilities:
1. Some one had access to your private key and your system was comprised.
2. You were withdrawing BTC from an exchange or an custodial wallet and they scammed you.