Forum Discussion
'Microsoft.MashupEngine; [Expression.Error] We cannot convert the value 504 to type List
Hello team,
I have upgaredd my Power BI desktop to Jan 2022 version long back and recently encountering an issue with the PBI desktop with this error :
Failed to save modifications to the server. Error returned: 'M Engine error: 'Microsoft.MashupEngine; [Expression.Error] We cannot convert the value 504 to type List.'. '.
Not sure what made it triggered all of sudden. Atatched the screenshot of the message that im getting - "The Report has not been upgraded to use the enhanced metadata format, which is required to make modeling changes".
Could you please help me how this issue could be resolved?
3 Replies
Microsoft is forcing you to move to the current metadata format. This has been announced a while back. Are you able to accept that change?
When I tried to update /accept the change, it is throwing me with this error :
Failed to save modifications to the server. Error returned: 'M Engine error: 'Microsoft.MashupEngine; [Expression.Error] We cannot convert the value 504 to type List.'. '.
Looks like the same dashboard is working fine for my other team member who is on Jan 2021 version - 2.88.2361.0 64-bit. I'm on Jan 2022 version.
