SQLAlchemy Error

(tb) crl-m1:sqlalchemy cooper$ black -v --color lib/sqlalchemy/event/legacy.py --experimental-string-processing
Using configuration from /private/tmp/primer_20210503/sqlalchemy/pyproject.toml.
Traceback (most recent call last):
  File "/Users/cooper/repos/black/src/black/__init__.py", line 770, in reformat_one
    if changed is not Changed.CACHED and format_file_in_place(
  File "/Users/cooper/repos/black/src/black/__init__.py", line 913, in format_file_in_place
    dst_contents = format_file_contents(src_contents, fast=fast, mode=mode)
  File "/Users/cooper/repos/black/src/black/__init__.py", line 1026, in format_file_contents
    dst_contents = format_str(src_contents, mode=mode)
  File "/Users/cooper/repos/black/src/black/__init__.py", line 1101, in format_str
    for line in transform_line(
  File "/Users/cooper/repos/black/src/black/__init__.py", line 2873, in transform_line
    result = run_transformer(line, transform, mode, features, line_str=line_str)
  File "/Users/cooper/repos/black/src/black/__init__.py", line 6902, in run_transformer
    result.extend(transform_line(transformed_line, mode=mode, features=features))
  File "/Users/cooper/repos/black/src/black/__init__.py", line 2873, in transform_line
    result = run_transformer(line, transform, mode, features, line_str=line_str)
  File "/Users/cooper/repos/black/src/black/__init__.py", line 6902, in run_transformer
    result.extend(transform_line(transformed_line, mode=mode, features=features))
  File "/Users/cooper/repos/black/src/black/__init__.py", line 2873, in transform_line
    result = run_transformer(line, transform, mode, features, line_str=line_str)
  File "/Users/cooper/repos/black/src/black/__init__.py", line 6898, in run_transformer
    for transformed_line in transform(line, features):
  File "/Users/cooper/repos/black/src/black/__init__.py", line 2970, in __call__
    for line_result in self.do_transform(line, string_idx):
  File "/Users/cooper/repos/black/src/black/__init__.py", line 4488, in do_transform
    assert (
AssertionError: Apparently, old parentheses do NOT exist?!
error: cannot format lib/sqlalchemy/event/legacy.py: Apparently, old parentheses do NOT exist?!
Oh no! 💥 💔 💥
1 file failed to reformat.