Unable to install plugin on Mac OS

[NyakudyaA]

Problem

Couldn't load plugin 'giswater' due to an error when calling its classFactory() method 

TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
Traceback (most recent call last):
  File "/Applications/QGIS-LTR.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 334, in _startPlugin
    plugins[packageName] = package.classFactory(iface)
  File "/Users/admire/Library/Application Support/QGIS/QGIS3/profiles/giswater/python/plugins/giswater/__init__.py", line 33, in classFactory
    return Giswater(iface)
  File "/Users/admire/Library/Application Support/QGIS/QGIS3/profiles/giswater/python/plugins/giswater/giswater.py", line 83, in __init__
    setting_file = os.path.join(self.plugin_dir, 'config', self.plugin_name + '.config')
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'


Python version: 3.8.7 (default, Feb 10 2021, 09:04:08) [Clang 12.0.0 (clang-1200.0.32.29)] 
QGIS version: 3.16.6-Hannover Hannover, 5fc23455ff 

Python Path:
/Applications/QGIS-LTR.app/Contents/MacOS/../Resources/python
/Users/admire/Library/Application Support/QGIS/QGIS3/profiles/giswater/python
/Users/admire/Library/Application Support/QGIS/QGIS3/profiles/giswater/python/plugins
/Applications/QGIS-LTR.app/Contents/MacOS/../Resources/python/plugins
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/cftime-1.2.1-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/matplotlib-3.3.0-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/numpy-1.20.1-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/geopandas-0.8.1-py3.8.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/Rtree-0.9.4-py3.8.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/statsmodels-0.11.1-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/patsy-0.5.1-py3.8.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/snuggs-1.4.7-py3.8.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/scipy-1.5.1-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/GDAL-3.2.1-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/Fiona-1.8.13.post1-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/netCDF4-1.5.4-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/numba-0.50.1-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/rasterio-1.1.5-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/Pillow-7.2.0-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/click_plugins-1.1.1-py3.8.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/lib-dynload
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/pandas-1.1.0-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python38.zip
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/affine-2.3.0-py3.8.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/pyproj-2.6.0-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages/opencv_contrib_python-4.3.0.36-py3.8-macosx-10.13.0-x86_64.egg
/Applications/QGIS-LTR.app/Contents/MacOS/lib/python3.8/site-packages
/Users/admire/Library/Application Support/QGIS/QGIS3/profiles/giswater/python
/Users/admire/Library/Application Support/QGIS/QGIS3/profiles/giswater/python/plugins/giswater/ui/..