This “cryptocurrency” sale results in a negative “cryptocurrency” balance in Imported Wallet - “wallet name”. [Review purchase history]
This warning means that, according to the transactions that you have synced in CoinTracker, you have a negative balance of a particular coin in that wallet. This happens if your transaction history is incomplete.
To fix: ensure that 100% of your cryptocurrency transactions across all exchanges, all coins, and all off-exchange wallets are added to CoinTracker.