Since upgrade to 1803 taskbar icon only present a window stating no app is associated???
The question is not very clear, but if you’re having trouble with the taskbar, it could be a problem with your account.
Try creating a new Windows 10 account and sign-in with to it. If the taskbar is working as expected, it would be recommended to migrate all your files and settings to the new account, and then delete the account that isn’t working.
Thank for the reply. When I pin an icon (that works on the desktop) to the task bar all I get is a window that states " This file does not have an app associated with it for performing this action. Please install an app, or if one already exists create an association in the Default Apps settings page" I cannot find where or how to do this. Not yet had time to create a new user.