Can't build html documentation

[BioBox]

I've created a python virtual environment and installed the requirements but I can't build the html documentation:

Running Sphinx v5.3.0
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 48 source files that are out of date
updating environment: [new config] 48 added, 0 changed, 0 removed
executing compound [  4%] elements/compound                                                 
executing connectors  6%] elements/connectors                                               
executing dspes... [  8%] elements/dsp                                                      
executing electrical 10%] elements/electrical                                               
executing flows... [ 12%] elements/flow                                                     
executing intcircuits14%] elements/intcircuits                                              
executing logic... [ 16%] elements/logic                                                    
executing analog.. [ 18%] gallery/analog                                                    

Extension error:
Cell raised uncaught exception:
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In [5], line 12
     10 I1 = d.add(elm.SourceI(d='down', botlabel='1A'))
     11 L2 = d.add(elm.Line(d='left', tox=V1.start))
---> 12 d.loopI([R1,R2,L2,V1], '$I_1$', pad=1.25)
     13 d.loopI([R1,I1,L2,R2], '$I_2$', pad=1.25)  # Use R1 as top element for both so they get the same height
     14 d.draw()

AttributeError: 'Drawing' object has no attribute 'loopI'
make: *** [Makefile:20: html] Error 2