Can't send XEM but I am fully synched

I am trying to send all my XEM to an exchange so I can sell for Bitcoin. I bought these yesterday but for some reason it won’t let me. My balance is 74 439.68 and my vested is 7 443.96

After I type all my information of the exchange’s address, I then click confirm, I get an error message stating:

ERROR 1205 NIS: TRANSACTION REJECTED INSUFFICIENT BALANCE

Any help would be appreciated

Thanks

Did you leave enough XEM to pay for the transaction fee?