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  • Pratik Ramani 9 posts 99 karma points
    May 11, 2023 @ 13:08
    Pratik Ramani

    Could not load type 'Umbraco.Core.PropertyEditors.PropertyValueTypeAttribute


    We tried all steps got so far for umbraco upgrade from 7 to 8 but still we face below error :

    -> System.TypeLoadException: Could not load type 'Umbraco.Core.PropertyEditors.PropertyValueTypeAttribute' from assembly 'Umbraco.Core, Version=, Culture=neutral, PublicKeyToken=null'.

    Any solution to fix above error ?

  • Bobby McGrath 1 post 71 karma points
    Oct 11, 2023 @ 10:15
    Bobby McGrath

    A little bit of a late response as I just came across something similar myself, but the ultimate cause of my issue was that I had a NutGet package installed which was no longer supported in version 8.

    The package was replaced with an alternative which supported Umbraco 8 thankfully so I was able to swap it out without loosing my functionality.

    The best bet if you (or anyone in a similar boat) comes across this is to gradually uninstall any NuGet packages which are not required by Umbraco itself and re-run the project until you have found the cause of the problem, then its just a case of hoping there is an alternative package available so you don't need to modify your source code too much!

    Hope this helps.

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