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  • Neel Shah 6 posts 26 karma points
    Nov 16, 2023 @ 18:51
    Neel Shah

    Value cannot be null. Parameter name: source


    Suddenly getting error of "Value cannot be null. Parameter name: source" while login in to Umbraco. But, website is running as expected. Can anyone please help me on it. We have Umbraco v6. It's high priority issue as want to update the contents.

    enter image description here

    Request you to please help me ASAP.

    Thanks in advance.

  • Marc Goodson 2149 posts 14355 karma points MVP 9x c-trib
    Nov 22, 2023 @ 15:22
    Marc Goodson

    Hi Neel

    Are you able to check in the database your umbracoUser entry for the user you are logging in with and their corresponding details in teh

    umbracoUser2App table?

    (if my memory serves me correct)

    Basically in Umbraco 6, the User Ids are mapped to the apps they are allowed access to, eg content, media users etc

    What your error message is saying is that when Umbraco tries to get the the applications for the user you have logged in with, the cupboard is bare! and an error is thrown.

    Now just recycling the app pool may make this all ok, there might be lots of reasons why GetApplications() is no longer retrieving the applications...

    but it could also be somehow the mappings in that table were wiped?



  • Neel Shah 6 posts 26 karma points
    Feb 24, 2024 @ 05:09
    Neel Shah

    Hi Marc,

    Thank you so much for the prompt response and that time I solved this issue to removing files from the hosted server but, again I got the same issue today and getting above error while login in umbraco.

    Somehow, I forgot which file I have removed from the server.

    And as you mentioned the user have access for respected apps in umbraco.

    Could you please help me out with this ASAP. So, will resolve this issue.

    Thank you in advance.

    Regards, Neel Shah

  • Neel Shah 6 posts 26 karma points
    Feb 24, 2024 @ 06:10
    Neel Shah

    Hi Marc,

    Finally, I got the resolution on it.

    I have just replaced the applications.config & trees.config files in Config folder and it's work as charm.

    Regards, Neel Shah

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