SQLFluff Lint not working for multilevel subdirectory sql file - sqlfluff

Question

we are trying to use SQLFluff in our project to avoid sql parser errors before deployment.
in our case we have subdirectories which contains sql files.
During Development we are running command sqlfluff lint command in root directory, we found that lint command is working for one level subdirectory sql path like below,
sqlfluff lint demo/complexquery.sql --dialect snowflake
But when we try for 2 level subdirectory sql file path, lint command is not working and giving error as below. could you please let me know whether iam missing syntax.
sqlfluff lint SQLScript/demo/complexquery.sql --dialect snowflake
Traceback (most recent call last):
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\toml\decoder.py", line 395, in loads
value, vtype = decoder.load_value(multilinestr)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\toml\decoder.py", line 849, in load_value
raise ValueError("Found tokens after a closed " +
ValueError: Found tokens after a closed string. Invalid TOML.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Program Files\Python310\lib\runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Program Files\Python310\lib\runpy.py", line 86, in run_code
exec(code, run_globals)
File "C:\Users\ar\AppData\Roaming\Python\Python310\Scripts\sqlfluff.exe_main.py", line 7, in
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\click\core.py", line 1130, in call
return self.main(*args, **kwargs)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\click\core.py", line 1055, in main
rv = self.invoke(ctx)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\click\core.py", line 1657, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\click\core.py", line 1404, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\click\core.py", line 760, in invoke
return __callback(*args, **kwargs)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\cli\commands.py", line 549, in lint
config = get_config(
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\cli\commands.py", line 361, in get_config
return FluffConfig.from_root(
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\core\config.py", line 613, in from_root
c = loader.load_config_up_to_path(
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\core\config.py", line 414, in load_config_up_to_path
[self.load_config_at_path(p) for p in config_paths]
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\core\config.py", line 414, in
[self.load_config_at_path(p) for p in config_paths]
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\core\config.py", line 338, in load_config_at_path
configs = self.load_config_file(p, fname, configs=configs)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\core\config.py", line 305, in load_config_file
elems = self._get_config_elems_from_toml(file_path)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\sqlfluff\core\config.py", line 191, in _get_config_elems_from_toml
config = toml.load(fpath)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\toml\decoder.py", line 134, in load
return loads(ffile.read(), _dict, decoder)
File "C:\Users\ar\AppData\Roaming\Python\Python310\site-packages\toml\decoder.py", line 397, in loads
raise TomlDecodeError(str(err), original, pos)
toml.decoder.TomlDecodeError: Found tokens after a closed string. Invalid TOML. (line 54 column 1 char 4192)