loading assemblies removed appdomain, removing invalidcastexception

i'm perplexing bucket assemblies removed app domain, nonetheless am controlling unequivocally uncanny problem. here's code:

    open stationary vacant loadassembly(string assemblypath)
    {

        twine pathtodll = assembly.getcallingassembly().codebase;
        appdomainsetup domainsetup = new appdomainsetup
        {
            privatebinpath = pathtodll
        };

        appdomain newdomain = appdomain.createdomain("assemblyloader",null,domainsetup);


        assemblyloader loader = (assemblyloader)newdomain.createinstancefromandunwrap(
            pathtodll,
            typeof(assemblyloader).fullname);

    }

assemblyloader another category same public one, inherits marshalbyref, however uncanny reason, i ban difference each i try run this. i even hardcoded route dll instead controlling getcallingassembly().codebase nonetheless i keep removing exception.

i know it's tough answer doubt but indeed observant carrying some-more information, nonetheless maybe someone run identical conditions know common "gotchas" i should feeling out for.

edit: reason i don't wish bucket directly since only biased code. ultimate idea category have slight bucket assemblies, gets guid info stores database digest i'm operative on. therefore, i bucket public removed app domain, i bucket others there too following empty app domain. indicate carrying assemblies hallowed generation app, i wholly need data.