If you have an errored posting in your Ledger postings report from an order that was marked as a "No show" and when you select the three dots > view details...
This pops up stating that "The posting is not balanced"...
This will mean that there is a miss match between the "Revenue" amount and the "Revenue reversal" amount. As you can see above "Revenue reversal" is £55 but the "Revenue" amount is only £45 therefore, there is a £10 difference. This is what is causing the error in this case.
If an order is marked as no show then only the revenue that is in the order at that time will be allocated to the no show revenue centre, and the remainder will need to be refunded so that the posting is balanced and can post.