How to Fix the ‘Stacked Wall’ Error When Loading Families Into Revit

At some point, you’re probably going to look like this guy – loading a family and you’ll be struck with the error “Last type in system family “Stacked Wall” cannot be deleted. ” and pulling your hair out.


What makes things more confusing is that the family that you try to load will likely have nothing to do with stacked walls, in fact both times I’ve had the problem has been with title block families.

To fix the problem, you need to open up your journal file which for 2015 is located at

Windows XP: %USERPROFILE%\Local Settings\Application Data\Autodesk\Revit\<Product name and release>\Journals
Windows Vista, Windows 7, Windows 8: %LOCALAPPDATA%\Autodesk\Revit\<Product name and release>\Journals

Once in the journal file, search for the term ‘ 0:< DBG_WARN: which is where the information you’re looking for starts. The following is from my journal file:

Jrn.Data “TaskDialogResult” _
, “You are trying to load the family Project-A3 SHEET, which already exists in this project. What do you want to do?”, _
“Overwrite the existing version and its parameter values”, “1002”
‘ 0:< DBG_WARN: Family contains category id -2009630, gstyle type 2, gstyle id 558659. That category id and gstyle type map to a gstyle id of invalidElementId in the project. (In practice, this is most commonly caused by a mismatch between the version number passed to addNewGStyles and the version number in the table in ProjectStyles.cpp, due to an incomplete renumbering of an upgrade.): line 503 of d:\ship\2015_px64\source\revit\revitdb\settings\GStyleElem.cpp.
‘ 0:< DBG_INFO: Write access to host’s DocumentHistory from content doc: line 4573 of d:\ship\2015_px64\source\revit\revitdb\document\Document.cpp.
‘ 0:< Unnecessary nesting;Family\FamilyDocument.cpp;642;FamilyLoad__UpdateReplicasInSmallDoc;N++EB(NB);
‘ 0:< Error posted:
‘ 0:< Last type in system family ‘Basic Wall’ cannot be deleted.
‘ 0:< Error posted:
‘ 0:< Last type in system family ‘Stacked Wall’ cannot be deleted.

In this instance there are 2 item id’s that are listed, you may have quite a few more than just two. Either way what you need to do is open up your family and using select by id tool, select and delete the elements listed as causing the problem.

2015-12-07_10-34-46Once the items are deleted, purge and audit for good measure and load back into your project.

Job done!