Just hit the same issue on a upgraded site, also not using modelbuilders (error didn't happen immedialty after upgrade but just popped up a couple days after)
Usually means that one of the DLLs (eg an Umbraco DLL) has not been properly upgraded. Can you check? Can you test with a fresh Umbraco install instead of an upgrade?
I found this as I was having the same problem on an old v7 upgrade. Was going well until I tried to go from 7.14 to 7.15 (then planning migration to 8).
My issue was the project was still targeting framework 4.5 and the UmbracoCms.Core package wasn't updated. Targeted later framework version which mean UmbracoCms.Core would update and then all good.
Problems with Umbraco.ModelsBuilder
I've got this error:
Could not load types from assembly Umbraco.ModelsBuilder, Version=3.0.1.92, Culture=neutral, PublicKeyToken=null, errors: Exception: System.TypeLoadException: Couldn't load type "Umbraco.Web.Editors.EditorValidator
1" from assembly "umbraco, Version=1.0.5820.25379, Culture=neutral, PublicKeyToken=null". Exception: System.TypeLoadException: Couldn't load type "Umbraco.Web.Editors.EditorValidator1" from assembly "umbraco, Version=1.0.5820.25379, Culture=neutral, PublicKeyToken=null". Exception: System.TypeLoadException: Couldn't load type "Umbraco.Web.Editors.EditorValidator1" from assembly "umbraco, Version=1.0.5820.25379, Culture=neutral, PublicKeyToken=null". Exception: System.TypeLoadException: Couldn't load type "Umbraco.Web.Editors.EditorValidator1" from assembly "umbraco, Version=1.0.5820.25379, Culture=neutral, PublicKeyToken=null". Exception: System.TypeLoadException: Couldn't load type "Umbraco.Web.Models.ContentEditing.ContentTypeSave1" from assembly "umbraco, Version=1.0.5820.25379, Culture=neutral, PublicKeyToken=null". Exception: System.TypeLoadException: Couldn't load type "Umbraco.Web.Models.ContentEditing.ContentTypeSave1" from assembly "umbraco, Version=1.0.5820.25379, Culture=neutral, PublicKeyToken=null". Exception: System.TypeLoadException: Couldn't load type "Umbraco.Web.Models.ContentEditing.ContentTypeSave`1" from assembly "umbraco, Version=1.0.5820.25379, Culture=neutral, PublicKeyToken=null".I even can't find the cause! I've reinstalled Umbraco several times but it didn't help.
Hello,
Sounds like the same problem as this topic: https://our.umbraco.org/forum/getting-started/installing-umbraco/75628-could-not-load-file-or-assembly-umbracomodelsbuilder-or-one-of-its-dependencies
Jeroen
Hi Roman, Did you find the fix for this error? I encounter the exact same thing after I upgrade from 7.3 to latest which is I think 7.4.
Anyone figure this one out?
Comment author was deleted
Just hit the same issue on a upgraded site, also not using modelbuilders (error didn't happen immedialty after upgrade but just popped up a couple days after)
Usually means that one of the DLLs (eg an Umbraco DLL) has not been properly upgraded. Can you check? Can you test with a fresh Umbraco install instead of an upgrade?
Comment author was deleted
Ok thanks, might be the case :) Yeah not getting it on a fresh install
I found this as I was having the same problem on an old v7 upgrade. Was going well until I tried to go from 7.14 to 7.15 (then planning migration to 8).
My issue was the project was still targeting framework 4.5 and the UmbracoCms.Core package wasn't updated. Targeted later framework version which mean UmbracoCms.Core would update and then all good.
Now onto the v8 migration. I may be back :)
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