What it means
Slippage protection fired. Between signing the swap and it being mined, the price moved, and the trade would have delivered less than the minimum you agreed to receive. The contract refused to fill at the worse price, which is the protection working, not a malfunction.
How to fix it
Retry with a slightly higher slippage tolerance, or when the market is calmer. For volatile or low-liquidity tokens, split the trade into smaller amounts. Raising slippage very high is not free: it widens what a sandwich bot can take from the trade.