The error 'OrderNumber":null' appears in your trading bot output when a buy or sell order could not be placed. The error itself does not describe the cause — it is a symptom of a separate problem.
Find the actual cause
The actual cause is always shown in an error message that appears directly before or after 'OrderNumber":null' in your bot output. Follow these steps to find it:
Go to your Dashboard.
Scroll down to the Output section at the bottom of the page.
Find the 'OrderNumber":null' message.
Look at the error message directly above or below it — that message describes the actual cause.
Search for that error in the knowledge base, or contact support if you need help resolving it.