Stairs Disappearing via Python

Revit
3

Hello
there is a missing parameter in the class PreprocessFailures function.
failuresAccessor without any other parameter becomes in fact the current instance of the class (which we must name “self” by convention in Python), you must therefore add a second parameter (whatever its name)

create stairs run

corrected code

import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument

clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
from Autodesk.Revit.DB.Architecture import StairsRun
			
class StairsFailurePreprocessor2( IFailuresPreprocessor ):
    def PreprocessFailures(self, failuresAccessor):		
		return FailureProcessingResult.Continue    

baseLevel = UnwrapElement(IN[0])
nextLevel = UnwrapElement(IN[1])
riserNum = IN[2]

TransactionManager.Instance.ForceCloseTransaction()

newStairsScope = StairsEditScope(doc, 'New Stairs')
newStairsId = newStairsScope.Start( baseLevel.Id, nextLevel.Id)


trans = Autodesk.Revit.DB.Transaction(doc, 'Stair Transaction')
trans.Start()

bdryCurves = list()
riserCurves = list()
pathCurves = list()

pt1 = XYZ(0,0,0)
pt2 = XYZ(15,0,0)
pt3 = XYZ(0,10,0)
pt4 = XYZ(15,10,0)

#boundary

bdryCurves.append(Line.CreateBound(pt1, pt2))
bdryCurves.append(Line.CreateBound(pt3, pt4))

#riser curves
for ii in range(riserNum):
	end0 = (pt1 + pt2) * ii / float(riserNum - 1)
	end1 = (pt3 + pt4) * ii / float(riserNum - 1)
	end2 = XYZ(end1.X, 10, 0)
	riserCurves.append(Line.CreateBound(end0,end2))

pathEnd0 = (pt1 + pt3) / 2.0
pathEnd1 = (pt2 + pt4) / 2.0
pathCurves.append(Line.CreateBound(pathEnd0, pathEnd1))

newRun1 = StairsRun.CreateSketchedRun(doc, newStairsId , baseLevel.Elevation , bdryCurves, riserCurves, pathCurves )
trans.Commit()
newStairsScope.Commit(StairsFailurePreprocessor2())

OUT = newRun1
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