Error using a shiny app on Windows makeTcpServer()

Hi there,

I try to use a shiny app which is written very userfriendy by launchGUI().
But I am ending up with the following error:

Listening on http://127.0.0.1:5863
Error in makeTcpServer(host, port, private$appWrapper$onHeaders, private$appWrapper$onBodyData, :
Static path must not have trailing slash.

the function LaunchGUI(), I already checked it with debug() does not seem to be the problem.

I am running it on Win10, R 3.6.3, shiny latest version
I guess it is a Windows issue, but does someone have an idea why?

The traceback:
traceback()
10: stop(list(message = "Static path must not have trailing slash.",
call = makeTcpServer(host, port, private$appWrapper$onHeaders,
private$appWrapper$onBodyData, private$appWrapper$call,
private$appWrapper$onWSOpen, private$appWrapper$onWSMessage,
private$appWrapper$onWSClose, private$appWrapper$staticPaths,
private$appWrapper$staticPathOptions, quiet), cppstack = NULL))
9: makeTcpServer(host, port, private$appWrapper$onHeaders, private$appWrapper$onBodyData,
private$appWrapper$call, private$appWrapper$onWSOpen, private$appWrapper$onWSMessage,
private$appWrapper$onWSClose, private$appWrapper$staticPaths,
private$appWrapper$staticPathOptions, quiet)
8: .subset2(public_bind_env, "initialize")(...)
7: WebServer$new(host, port, app, quiet)
6: startServer(host, port, httpuvApp)
5: startApp(appParts, port, host, quiet)
4: runApp(x, port = 5863)
3: do.call("runApp", args)
2: print.shiny.appobj(x)
1: (function (x, ...)
UseMethod("print"))(x)

I would be very glad for a hint !

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