When you change your crypto exchange within the same trading bot, the error 'Invalid / Disabled market error for chart data on URL:' can sometimes come up.

Your trading bot retrieves chart data from the current selected crypto exchange. If you still have position from a different crypto exchange, this error will show. It means your trading bot is trying to pull chart data for these old positions that can now not be retrieved.

The solution is to remove these open positions from your trading bot by clicking on 'Info' > 'Actions' > 'Remove' in the open position itself, and use the synchronize tool to check for unsynchronized positions.