Loading .Net assembly in App Designer fails

Hi everyone

I need to load a .NET assembly (uEyeDotNet.dll) in my App Designer GUI to communicate with a camera. In the startupFnc() function I add the assembly

as follows:

function startupFcn(app)
    asm = System.AppDomain.CurrentDomain.GetAssemblies;
    if ~any(arrayfun(@(n) strncmpi(char(asm.Get(n-1).FullName), ...
            'uEyeDotNet', length('uEyeDotNet')), 1:asm.Length))  
        
        NET.addAssembly('C:/Program Files/IDS/uEyeCam/Develop/DotNet/uEyeDotNet.dll');   
    end
    
    %...
    
end

It fails with an error that the assembly or any dependancy could not be found:

If i execute the same code in the "normal" matlab workspace, it works and can be used.

So, how do i properly load it in the App Designer? It seems that the workspace is different or a path of it.

Hoping for help :-)

Georg