ERROR: LoadError: PyError ($(Expr(:escape, :(ccall(#= /home/lissanro/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:43 =# @pysym(:PyObject_Call), PyPtr, (PyPtr, PyPtr, PyPtr), o, pyargsptr, kw))))) <class 'TypeError'>
TypeError("'<' not supported between instances of 'PyCall.jlwrap' and 'PyCall.jlwrap'")
  File "/usr/local/lib/python3.8/dist-packages/fastai2/vision/data.py", line 51, in from_name_func
    return cls.from_path_func(path, fnames, f, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/vision/data.py", line 45, in from_path_func
    return cls.from_dblock(dblock, fnames, path=path, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/core.py", line 149, in from_dblock
    return dblock.dataloaders(source, path=path, bs=bs, val_bs=val_bs, shuffle_train=shuffle_train, device=device, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/block.py", line 97, in dataloaders
    dsets = self.datasets(source)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/block.py", line 94, in datasets
    return Datasets(items, tfms=self._combine_type_tfms(), splits=splits, dl_type=self.dl_type, n_inp=self.n_inp, verbose=verbose)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/core.py", line 261, in __init__
    self.tls = L(tls if tls else [TfmdLists(items, t, **kwargs) for t in L(ifnone(tfms,[None]))])
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/core.py", line 261, in <listcomp>
    self.tls = L(tls if tls else [TfmdLists(items, t, **kwargs) for t in L(ifnone(tfms,[None]))])
  File "/usr/local/lib/python3.8/dist-packages/fastcore/foundation.py", line 41, in __call__
    res = super().__call__(*((x,) + args), **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/core.py", line 202, in __init__
    self.setup(train_setup=train_setup)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/core.py", line 215, in setup
    self.tfms.setup(self, train_setup)
  File "/usr/local/lib/python3.8/dist-packages/fastcore/transform.py", line 178, in setup
    for t in tfms: self.add(t,items, train_setup)
  File "/usr/local/lib/python3.8/dist-packages/fastcore/transform.py", line 182, in add
    t.setup(items, train_setup)
  File "/usr/local/lib/python3.8/dist-packages/fastcore/transform.py", line 77, in setup
    return self.setups(getattr(items, 'train', items) if train_setup else items)
  File "/usr/local/lib/python3.8/dist-packages/fastcore/dispatch.py", line 98, in __call__
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/transforms.py", line 181, in setups
    if self.vocab is None and dsets is not None: self.vocab = CategoryMap(dsets, add_na=self.add_na)
  File "/usr/local/lib/python3.8/dist-packages/fastai2/data/transforms.py", line 167, in __init__
    if sort: items = items.sorted()
  File "/usr/local/lib/python3.8/dist-packages/fastcore/foundation.py", line 348, in sorted
    return self._new(sorted(self.items, key=k, reverse=reverse))

Stacktrace:
 [1] pyerr_check at /home/lissanro/.julia/packages/PyCall/zqDXB/src/exception.jl:60 [inlined]
 [2] pyerr_check at /home/lissanro/.julia/packages/PyCall/zqDXB/src/exception.jl:64 [inlined]
 [3] _handle_error(::String) at /home/lissanro/.julia/packages/PyCall/zqDXB/src/exception.jl:81
 [4] macro expansion at /home/lissanro/.julia/packages/PyCall/zqDXB/src/exception.jl:95 [inlined]
 [5] #110 at /home/lissanro/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:43 [inlined]
 [6] disable_sigint at ./c.jl:446 [inlined]
 [7] __pycall! at /home/lissanro/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:42 [inlined]
 [8] _pycall!(::PyObject, ::PyObject, ::Tuple{PyObject,PyObject,typeof(is_cat)}, ::Int64, ::PyObject) at /home/lissanro/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:29
 [9] _pycall!(::PyObject, ::PyObject, ::Tuple{PyObject,PyObject,typeof(is_cat)}, ::Base.Iterators.Pairs{Symbol,Any,Tuple{Symbol,Symbol},NamedTuple{(:item_tfms, :bs),Tuple{PyObject,Int64}}}) at /home/lissanro/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:11
 [10] (::PyObject)(::PyObject, ::Vararg{Any,N} where N; kwargs::Base.Iterators.Pairs{Symbol,Any,Tuple{Symbol,Symbol},NamedTuple{(:item_tfms, :bs),Tuple{PyObject,Int64}}}) at /home/lissanro/.julia/packages/PyCall/zqDXB/src/pyfncall.jl:86
 [11] top-level scope at /tmp/fastai.jl:12
 [12] include(::Module, ::String) at ./Base.jl:377
 [13] exec_options(::Base.JLOptions) at ./client.jl:288
 [14] _start() at ./client.jl:484
in expression starting at /tmp/fastai.jl:12