Solution Import issue on Dynamics 365 CRM v9.1

As we all know Microsoft has recently released Dynamics V9.1. After release, most of the customers upgraded on v9.1. When we tried to import the managed solution from dev CRM instance to customer end then we got the below error. The customer CRM version is 9.1.0.30

Below is the error exact we got from Downloaded log file.

Form factor code 0 is missing a CustomControl declaration

This strange issue, we never encounter this kind of issue before. After some research and play around we found possible cause of this issue.

1. We have exported the solution from older version of CRM i.e. 9.1.0.35.
2. The lead which is failing has Editable grid Enable because form factor 0 used Editable grid control.

This issue got resolve when our customers upgraded to 9.1.0.274 and this time same solution imported successfully.

Hope this helps!