If you copy a layout with a customview (example speakButton) from another application into your existing one and open the layout in designer view, the Custom Type line shows the package name of the application where it came from followed by the word ‘speakbutton’ instead of the word ‘SpeakButton’. Example: com.b4a.example.speakbutton. You have to use the drop down to change it to simply ‘SpeakButton’, otherwise your application will crash.