The issue is that your code is trying to validate the properties requiring them to be of the class next to them. When your app is created, Matlab is trying to initialize these properties as tcpclient.empty() and serialport.empty(). More on property validation in this article
While tcpclient is actually a class (and therefore tcpclient.empty() does exist as a method), serialport is not. The command serialport is a function whose output is an element of the class internal.Serialport. What you can do is replace the 'serialport' by 'internal.Serialport'
Hope that helped :)
