What it means
A Uniswap V3 safe-transfer-from failure. The router tried to pull tokens from your wallet and the transfer returned false, which in practice means a missing or insufficient token approval, or a token with unusual transfer behaviour (fee-on-transfer, blocklists).
How to fix it
Approve the token for the router and retry. If the approval is in place and STF persists, the token itself may take a fee on transfer or restrict transfers, and the trade needs a route or setting that tolerates that.