No money error when executing a trade

 
Hi, 
I have an EA on the GBPUSD, it’s been trying to make a trade for a while now but the following error message keeps coming up:
“request failed market sell 0.06 GBPUSD [No money]”.
What does this mean?
How can I fix it?
There’s still money available in the demo account so I’m not really sure why it’s having trouble.
Thanks

 
wilsbt: I have an EA on the GBPUSD, it’s been trying to make a trade for a while now but the following error message keeps coming up:
“request failed market sell 0.06 GBPUSD [No money]”.
What does this mean?
How can I fix it?
There’s still money available in the demo account so I’m not really sure why it’s having trouble.
The volume (0.06 lots) is too high for the amount of money in your account! learn to calculate your risk!