Connectivity.InventorAddin.EdmAddin Error in Inventor 2021

[tfrohe_LSI]

I have an Inventor 2021 add-in that does various things for my company. There are a couple buttons that do things with Vault. Recently, and I can't put my finger on exactly when, the Vault specific features have stopped working. I am getting the following error:

System.IO.FileLoadException: 'Could not load file or assembly 'Connectivity.InventorAddin.EdmAddin, Version=26.2.24.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)'

When calling the following Sub

    Private Sub LoginToVault()
        Dim security As EDM = EDM.Instance
        If Not security.IsSignedIn() Then
            g_inventorApplication.StatusBarText = "Logging into Vault"
            RunLineCommand("LoginCmdIntName")
        End If

        m_conn = security.VaultConnection
        g_inventorApplication.StatusBarText = ""
    End Sub

The error is happening on the line that calls this Sub.

I have a reference setup in my project for Connectivity.InventorAddin.EdmAddin located at C:\Program Files\Autodesk\Inventor 2021\Bin\Connectivity.InventorAddin.EdmAddin.dll

We are actually using Inventor 2021. Please advise. Thank you.

[JelteDeJong · Accepted solution]

a quick Google search led me to believe that it has to do something with signed or unsigned assemblies. I have never dealt with this kind of problem but maybe this can help you:

https://stackoverflow.com/questions/290980/error-a-strongly-named-assembly-is-required

[tfrohe_LSI]

The problem was, I was signing the assembly. I usually do not do that. I was experimenting and didn't put it together in my head that that was causing a problem. Thank you for pointing me in the right direction.