"Not enough money" means that there is not enough margin on your account to open a position of the desired volume.
What to do in this situation?
- Deposit funds to your account or transfer them from the other one to increase the amount of free margin.
- Reduce the volume of the position you want to open.
- Close other open positions on your account.
How to find out the amount of margin required for opening a position?
You can use the calculation formula:
<Margin> = <Size of the contract> / <Leverage>