This BTC transfer results in a negative BTC balance in BTC Wallet

Hello,
I am getting below error while transferring bitcoin from coin-tracker to Coindcx Exchange Wallet.
This BTC transfer results in a negative BTC balance in BTC Wallet …6eau6y. [Review purchase history].
Trader says i have pay network fee then it will allow me to transact. Can anyone please help me on this.

Regards,
Bala