No constructor found for widget mxui.widget.ActionButton

After running my app in Sandbox I get the following error "No constructor found for widget mxui.widget.ActionButton" This error occurs on the place where a Microwflow button is. This button was a Microflow with a showpage action in it. The project was build in previous Mendix release 16.1 and converted to mendix 17.1. The Strange thing is that when I run the app Locally It doesn't show this error but shows the button. Any suggestions?
1 answers

I run multiple projects in different versions of Mendix and I run into this error frequently. My solution is to clear my browser's cache (ctrl + shift + delete is the usual hotkey for this).