I'm trying to import an add-on solution into our on-premise (v9) organization, and I'm getting the error:
"The solution package you are importing was generated on Microsoft Dynamics 365 (online). You can’t import it into on-premises or hosted versions of Microsoft Dynamics 365."
The solution is set to version 9.0, so that's not what it's complaining about. Since when can solutions not be used on either platform? We've imported a number of solutions before and never had to download an on-premise-specific version...