It seems the coin is a fork of DASH, so this may be relevant.
According to
https://www.dash.org/forum/index.php?threads/amount-exceeds-balance-msg-when-sufficient-dash-is-present.48206/, Make sure the blockchain is synchronized. And try to use coin control.
If it still does not work, the amount you are trying to send maybe does exceed the balance you have.
If you are trying to send out a privatesend transaction, you have two options :
Option 1 : lower your number of rounds to mix (which will give you lower privacy, but could give some of your input amounts enough rounds now to get your 10.4 Dash out)
Option 2 : Raise your number of rounds to mix with one extra round (hopefully this will now include all necessary input amounts, so you can get your 10.4 Dash out)
Another relevant similar issue can be seen:
https://www.youtube.com/watch?v=APeo9UKk-BM. On the video it shown about transparent and private balances, since it is forked, your coin might also have a different term in regard to the transaction type.