Error while installing @jupyterlab/toc

[HiIamJeff]

When I tried to install it, this occurred. Please let me know if anyone experiences this problem. Thanks!

PS C:\Users\ADMIN> jupyter labextension install @jupyterlab/toc
Building jupyterlab assets (build:prod:minimize)
\Exception in thread Thread-10:
Traceback (most recent call last):
  File "C:\Users\ADMIN\Anaconda3\envs\latest_env\lib\threading.py", line 926, in _bootstrap_inner
    self.run()
  File "C:\Users\ADMIN\Anaconda3\envs\latest_env\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\ADMIN\Anaconda3\envs\latest_env\lib\subprocess.py", line 1267, in _readerthread
    buffer.append(fh.read())
  File "C:\Users\ADMIN\Anaconda3\envs\latest_env\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x8d in position 264: character maps to <undefined>

An error occured.
IndexError: list index out of range
See the log file for details:  C:\Users\ADMIN\AppData\Local\Temp\jupyterlab-debug-sl0_imn1.log