@mix I’ve just written a fix for the bimorph.DuplicateSheets node which prevents the error you reported from occurring. Its available for download using the Package Manager (v1.5.0). Please note this is a fix and may still contain bugs. Schedules are not supported in this version, nor is character cleaning or text notes, detail lines or Symbols placed on sheets. These features will be available in bimorphNodes v2.0
It’s worth mentioning character cleaning as this may cause you more errors. Basically the following characters are illegal for view names: **][:{}|;<>?~** The problem is some views, like the default 3D views circumvents this restriction without Revit kicking up a fuss (_{3D}_ for example). The problem this causes for nodes that duplicate views and names them using the original view name + a prefix and/or suffix (likebimorph.DuplicateSheets`) is Revit will throw an exception which terminates the node process. As mentioned, v2.0 handles this exception by ‘cleaning’ view names of illegal characters using a simple Regular Expression, but this feature is not in the fix I’ve just issued. Therefore, check your view names prior to running the update and remove the above characters from your views where necessary as this will be the final barrier to a successful run.