I've read that deleting the Content of the App_Plugins solved the problem for some people, but in my case I have custom Datatypes, so thats not an Option.
Did someone also had this problem? I Upgraded from 9.5.x to latest 10 version for Umbraco.Cms and Umbraco.Forms Packages.
Thanks for your reply. I fixed the problem yester day. As @Yakov Lebski mentioned it was because in App_Plugins folder there were packages which contained v9 Datatypes. When upgrading the internal Packages I loaded custom datatypes twice.
Once from the old package still from App_PLugins folder
Once from Nuget
Therefore I had to delete contents for internal packages so the new ones are stored there.
Error when Upgrading from Umbraco 9 to Umbraco 10
Hello there,
I want to upgrade from Umbraco 9 to 10. I have done the upgrade according to the Documentation https://docs.umbraco.com/umbraco-cms/fundamentals/setup/upgrading/version-specific but I'm facing an error when starting the project in Umbraco.
I've read that deleting the Content of the App_Plugins solved the problem for some people, but in my case I have custom Datatypes, so thats not an Option.
Did someone also had this problem? I Upgraded from 9.5.x to latest 10 version for Umbraco.Cms and Umbraco.Forms Packages.
Thanks for your help!
check app_plugins in root and wwwroot folders, I think comes from old Unbraco Forms
Thanks for your reply. I fixed the problem yester day. As @Yakov Lebski mentioned it was because in App_Plugins folder there were packages which contained v9 Datatypes. When upgrading the internal Packages I loaded custom datatypes twice.
Therefore I had to delete contents for internal packages so the new ones are stored there.
Hopefully this helps someone :)
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