I tried Stitcher quite a while ago and it worked perfectly. No I am not able to add a component to an open path. I did follow the instructions and I think I did not miss anything. Does stitcher have a problem with the latest Glyphs 3.2 (3180)?
Thank you for any help. 

No error in macro window?
Hi Rainer,
thank you for your reply. This is the error (I repeated it with another component right now):
Stitcher Error in getFineGrainPointsForPath():
'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 85, in getFineGrainPointsForPath
segmentLength = thisSegment.length()
AttributeError: 'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 143, in dotCoordsOnPath
for thisPoint in fineGrainPoints:
TypeError: 'NoneType' object is not iterable
Stitcher Error:
'NoneType' object is not iterable
Traceback (most recent call last):
File "plugin.py", line 225, in placeDots
for thisPoint in dotCoordsOnPath( thisPath, distanceBetweenDots, balanceOverCompletePath ):
TypeError: 'NoneType' object is not iterable
-- Could not place components at intervals of 50.0 units.
Stitcher Error in getFineGrainPointsForPath():
'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 85, in getFineGrainPointsForPath
segmentLength = thisSegment.length()
AttributeError: 'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 143, in dotCoordsOnPath
for thisPoint in fineGrainPoints:
TypeError: 'NoneType' object is not iterable
Stitcher Error:
'NoneType' object is not iterable
Traceback (most recent call last):
File "plugin.py", line 225, in placeDots
for thisPoint in dotCoordsOnPath( thisPath, distanceBetweenDots, balanceOverCompletePath ):
TypeError: 'NoneType' object is not iterable
-- Could not place components at intervals of 50.0 units.
Stitcher Error in getFineGrainPointsForPath():
'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 85, in getFineGrainPointsForPath
segmentLength = thisSegment.length()
AttributeError: 'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 143, in dotCoordsOnPath
for thisPoint in fineGrainPoints:
TypeError: 'NoneType' object is not iterable
Stitcher Error:
'NoneType' object is not iterable
Traceback (most recent call last):
File "plugin.py", line 225, in placeDots
for thisPoint in dotCoordsOnPath( thisPath, distanceBetweenDots, balanceOverCompletePath ):
TypeError: 'NoneType' object is not iterable
-- Could not place components at intervals of 50.0 units.
Stitcher Error in getFineGrainPointsForPath():
'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 85, in getFineGrainPointsForPath
segmentLength = thisSegment.length()
AttributeError: 'tuple' object has no attribute 'length'
Traceback (most recent call last):
File "plugin.py", line 143, in dotCoordsOnPath
for thisPoint in fineGrainPoints:
TypeError: 'NoneType' object is not iterable
Stitcher Error:
'NoneType' object is not iterable
Traceback (most recent call last):
File "plugin.py", line 225, in placeDots
for thisPoint in dotCoordsOnPath( thisPath, distanceBetweenDots, balanceOverCompletePath ):
TypeError: 'NoneType' object is not iterable
-- Could not place components at intervals of 50.0 units.
Thank you
Yes itโs pretty broken. Donโt know how that could happen. Will take a look but could take a day or two.
I fixed it. Can you try if it works for you now?
YESSS.

Thank you both for your fast help and support!