Straight dump of the error message:

 Traceback (most recent call last):
  File "/usr/bin/colcon", line 11, in <module>
    load_entry_point('colcon-core==0.6.1', 'console_scripts', 'colcon')()
  File "/usr/lib/python3/dist-packages/colcon_core/command.py", line 118, in main
    return _main(command_name=command_name, argv=argv)
  File "/usr/lib/python3/dist-packages/colcon_core/command.py", line 161, in _main
    args = parser.parse_args(args=argv)
  File "/usr/lib/python3/dist-packages/colcon_defaults/argument_parser/defaults.py", line 129, in parse_args
    return self._parser.parse_args(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/colcon_argcomplete/argument_parser/argcomplete/__init__.py", line 85, in parse_args
    from argcomplete import autocomplete
ImportError: cannot import name 'autocomplete' from 'argcomplete' (/home/denzel/.local/lib/python3.8/site-packages/argcomplete/__init__.py)