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anu35anu35 

Error on Challenge #9 of Data Integration Specialist.

Hi All,

I am getting below Error on Challenge #9 of Data Integration Specialist.

Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.ExternalObjectException: This data is no longer available. The "Invoices" table in the external system is currently unavailable. Try again later or contact your administrator for help.
Any help will be greatly appreciated.

Thnaks ,
Marcelo CostaMarcelo Costa
This probably means what it says... :) the external database became unavailable. 
Go to Setup-> External datasources and validate and sync again... If there are any problems check the URL again.
Good Luck!
anu35anu35
Thanks for your reply Marcelo,

I did the validate and sync again but now am facing another issues . when I do Sync the Field Label is changing from External ID to projectRef getting error Like....
Challenge Not yet complete... here's what's wrong: 
The 'invoices__x' external object does not appear to contain the correct fields.
How to resolve it.. Below are my Fields.

User-added image


Thanks In Advance....
Ramprasad vempatiRamprasad vempati
@anu35 Make projectRef__c an Indirect Lookup and try.