Error: register_uninstall_hook was called incorrectly

I have had to disable the plugin as it is no longer working and causing an error on my website. As a result my Android app has been non functional for several days now.

I am getting the following error:

Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information.