AttributeError: 'NoneType

[uralkaflehydrosim]

AttributeError: 'NoneType' object has no attribute 'index'
Traceback (most recent call last):
File "C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\rivergis\rivergis.py", line 112, in
self.ui.actionRASCreateRASGISImport.triggered.connect(lambda: r1d.ras1dCreateRasGisImportFile(self))
File "C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\rivergis\ras1dFunctions.py", line 476, in ras1dCreateRasGisImportFile
sdf = rgi.gis_import_file()
File "C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\rivergis\ras_gis_import.py", line 93, in gis_import_file
imp = self.header.build_header()
File "C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\rivergis\ras_gis_import.py", line 172, in build_header
se = self.spatial_extent()
File "C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\rivergis\ras_gis_import.py", line 138, in spatial_extent
box_min = box[box.index('(')+1:box.index(',')].split()
AttributeError: 'NoneType' object has no attribute 'index'

Python version: 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)]
QGIS version: 3.10.2-A Coruña A Coruña, d4cd3cfe5a

Python Path:
C:/PROGRA1/QGIS31.10/apps/qgis/./python
C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python
C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins
C:/PROGRA1/QGIS31.10/apps/qgis/./python/plugins
C:\PROGRA1\QGIS31.10\apps\Python37
C:\PROGRA1\QGIS31.10\apps\Python37\Scripts
C:\Program Files\QGIS 3.10\bin\python37.zip
C:\PROGRA1\QGIS31.10\apps\Python37\DLLs
C:\PROGRA1\QGIS31.10\apps\Python37\lib
C:\Program Files\QGIS 3.10\bin
C:\PROGRA1\QGIS31.10\apps\Python37\lib\site-packages
C:\PROGRA1\QGIS31.10\apps\Python37\lib\site-packages\win32
C:\PROGRA1\QGIS31.10\apps\Python37\lib\site-packages\win32\lib
C:\PROGRA1\QGIS31.10\apps\Python37\lib\site-packages\Pythonwin
C:/Users/dell/AppData/Roaming/QGIS/QGIS3\profiles\default/python
C:\Users\dell\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\crayfish\gui..\pyqtgraph-0.10.0-py2.py3-none-any.whl
C:/Users/dell/Downloads/baldeagle/BaldEagle_example