Cashier - Deposits - Skrill/Neteller: Insufficient Funds
This error is due to the payment service (Neteller/Skrill) not supporting this specific transaction.
The insufficient balance does not refer to your account actually not possessing any balance or an issue with your GGPoker account; rather, this refers to the payment service declining this transaction due to your account settings/compatibility with them.
It would be advised for you to contact the payment service support in regards to more details of your account.