Common Xero error messages

Below are a list of common Xero error messages along with an explanation of how to re-sync your invoices: 

Code Action
Your Xero connection has been lost Head to Settings>Connect to Xero the log back in.  Your invoices should sync, if they don't give us a shout
You have reached the limit of invoices you can approve Check your Xero account allowance, your package may need upgrading.
Invoice not of valid status for creation Cancelled invoices cannot be synced to Xero.
An unhandled exception occurred while processing the request. Exception: invalid_grant Disconnect and reconnect to Xero from the settings.  
Head to Settings>Connection to Xero
The contact with the specified contact details has been archived YourTradebase is unable to find the original contact details in Xero.  Check contact hasn't been archived or changed in Xero
Invoice with a total less than 0 cannot be synced with Xero as Xero wont allow it. If you're trying to create a credit note, you'll need to manually create that in Xero Any invoice that includes a minus (-) amount cannot be synced with Xero.  This includes credit notes or minus amounts within an invoice .
Account code '200' has been archived, or has been deleted. Each line item must reference a valid account Check the set up codes by head to settings>connect to Xero>settings.  
Check code 200 hasn't been archived in Xero
Date cannot be changed on an invoice that has payment or credit notes allocated to it. You will need to manually change the dates in Xero directly.
The status AUTHORISED cannot be applied to the invoice because it has payment or Credit notes allocated to it. Remove any payments for this invoice in Xero
The contact with the specified contact details has been archived. The contact must be un-archived before creating new invoices or credit notes Find out more on how to restore your contacts here:
https://central.xero.com/s/article/Archive-or-restore-contacts
Invoices Invoices failed with the following errors: Sequence contains no matching element
Delete special characters and use a hyphen or underscore instead. Delete extra spaces.
Invoices which already have payments cannot be updated in Xero. Any invoice changes you've made have not been synced with Xero. You'll need to manually update this invoice in Xero to make any changes Xero does not allow us to make changes to invoices that have already had the FULL payment allocated to them.  Once the invoice is paid in full Xero will completed invoice and close it off to any changes.   You will need to manually update the invoice in Xero if you need to it. 

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