GP 2016 Web Client - Mods do not display, or throw errors in Web Client

Ensure gp web server has all customizations installed and is pointing to shared dictionaries.





https://winthropdc.wordpress.com/2015/04/08/how-to-enable-visual-studio-tools-customisations-for-the-web-client/

Your VB code needs to explicitly state the mod is available in the web client

Enable Mod in VB

<SupportedDexPlatforms(DexPlatforms.DesktopClient Or DexPlatforms.WebClient)>

Public Class GPAddIn

    Implements IDexterityAddIn

    ' IDexterityAddIn interface

    Sub Initialize() Implements IDexterityAddIn.Initialize

    End Sub

End Class