Dialog module '<dialog>' is not allowed in group '<dialoggroup>'
The installation dialog box referenced in the error message cannot be placed in the specified group. Some installation dialog boxes must appear in a specific sequence during installation — for example, the Finished dialog box must always be displayed last, and the Progress dialog box can only be displayed during the progress phase.
To correct this error
Double-click the error message in the Task List to go to the referenced dialog box in the User Interface Editor.
Move the dialog box to a different node by using a drag-and-drop operation or the Cut and Paste commands.