As stated in the message, you selected the option only to run a single order or all cBot instances, just turn this feature off to remove the message.
https://clickalgo.com/neptune-adjustable-settings
Single/Trade Account
Use this feature if you only want a single trade open at any time for all 10 trading robots, this is useful for small accounts or when you wish to keep your drawdown to a minimum, as the cBots do not open many trades per year, it is not often anyway there will be many trades open for all 10 cBots.