Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/snakemake/__init__.py", line 654, in snakemake
    workflow.include(
  File "/usr/local/lib/python3.9/site-packages/snakemake/workflow.py", line 1213, in include
    code, linemap, rulecount = parse(
  File "/usr/local/lib/python3.9/site-packages/snakemake/parser.py", line 1274, in parse
    for t, orig_token in automaton.consume():
  File "/usr/local/lib/python3.9/site-packages/snakemake/parser.py", line 100, in consume
    for t, orig in self.state(token):
  File "/usr/local/lib/python3.9/site-packages/snakemake/parser.py", line 1226, in python
    for t in self.subautomaton(token.string).consume():
  File "/usr/local/lib/python3.9/site-packages/snakemake/parser.py", line 100, in consume
    for t, orig in self.state(token):
  File "/usr/local/lib/python3.9/site-packages/snakemake/parser.py", line 175, in block
    yield from self.block_content(token)
TypeError: 'NoneType' object is not iterable