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  • Linden Koppejan 15 posts 165 karma points
    Jan 11, 2024 @ 09:48
    Linden Koppejan
    0

    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.

    enter image description here

    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!

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  • Yakov Lebski 590 posts 2344 karma points
    Jan 11, 2024 @ 19:30
    Yakov Lebski
    0

    check app_plugins in root and wwwroot folders, I think comes from old Unbraco Forms

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  • Linden Koppejan 15 posts 165 karma points
    Jan 12, 2024 @ 07:28
    Linden Koppejan
    100

    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.

    1. Once from the old package still from App_PLugins folder
    2. Once from Nuget

    Therefore I had to delete contents for internal packages so the new ones are stored there.

    Hopefully this helps someone :)

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