Argument neither class nor type?

Why am I getting a runtime error in mit app inventor it says argument neither class nor type


and here is my code, and how can I fix it.

Please let us know, when exactly that error occurs and provide a screenshot of that error
Taifun

Odd I went back just now and it was fine, however the tabs I made using the comp creator extension made the tabs identical

This is just wrong:

You create (with compCreator) a webviewer in VA1, then you create a CustomWebView in VA1.

Others and myself have told you to choose one (webviewer/webviewextra) or the other (customwebview). You cannot mix them both up like this.

Yes, but you lost me were do I use webviewextra. Also please don't get mad I am just trying to learn