error starting main.py

[Luckyman7471]

Hello,

Unfortunately, I always get the following error message when I start the main.py
Does anyone have any idea what the problem is here

Traceback (most recent call last):
File "kivy/properties.pyx", line 2023, in kivy.properties.ColorProperty.convert
File "kivy/properties.pyx", line 2041, in kivy.properties.ColorProperty.parse_list
ValueError: Invalid value for color (got [])

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/pi/.local/lib/python3.7/site-packages/kivy/lang/builder.py", line 701, in _apply_rule
setattr(widget_set, key, value)
File "kivy/weakproxy.pyx", line 35, in kivy.weakproxy.WeakProxy.setattr
File "kivy/properties.pyx", line 498, in kivy.properties.Property.set
File "kivy/properties.pyx", line 527, in kivy.properties.Property.set
File "kivy/properties.pyx", line 2025, in kivy.properties.ColorProperty.convert
ValueError: MDTabsLabel.color has an invalid format (got [])

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "main.py", line 104, in
MainApp().run()
File "/home/pi/.local/lib/python3.7/site-packages/kivy/app.py", line 949, in run
self._run_prepare()
File "/home/pi/.local/lib/python3.7/site-packages/kivy/app.py", line 919, in _run_prepare
root = self.build()
File "main.py", line 83, in build
self.root = MainScreen(config)
File "main.py", line 31, in init
self.navigation = Navigation(config['rooms'])
File "/home/pi/dashzero-master/gui/core/navigation.py", line 28, in init
self.add_widget(NavigationItem(room))
File "/home/pi/dashzero-master/gui/core/navigation.py", line 8, in init
super(NavigationItem, self).init(**kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/uix/boxlayout.py", line 145, in init
super(BoxLayout, self).init(**kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/uix/layout.py", line 76, in init
super(Layout, self).init(**kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/kivymd/uix/tab.py", line 374, in init
self.tab_label = MDTabsLabel(tab=self)
File "/home/pi/.local/lib/python3.7/site-packages/kivymd/uix/tab.py", line 328, in init
super().init(**kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/uix/behaviors/togglebutton.py", line 84, in init
super(ToggleButtonBehavior, self).init(**kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/uix/behaviors/button.py", line 121, in init
super(ButtonBehavior, self).init(**kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/uix/label.py", line 318, in init
super(Label, self).init(**kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/uix/widget.py", line 361, in init
rule_children=rule_children)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/uix/widget.py", line 465, in apply_class_lang_rules
rule_children=rule_children)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/lang/builder.py", line 543, in apply
rule_children=rule_children)
File "/home/pi/.local/lib/python3.7/site-packages/kivy/lang/builder.py", line 712, in _apply_rule
e), cause=tb)
kivy.lang.builder.BuilderException: Parser: File "", line 19:
...
17: )
18: color:

19: self.text_color_active if self.state == 'down' else self.text_color_normal
20: on_x: self._trigger_update_tab_indicator()
21: on_width: self._trigger_update_tab_indicator()
...
ValueError: MDTabsLabel.color has an invalid format (got [])
File "/home/pi/.local/lib/python3.7/site-packages/kivy/lang/builder.py", line 701, in _apply_rule
setattr(widget_set, key, value)
File "kivy/weakproxy.pyx", line 35, in kivy.weakproxy.WeakProxy.setattr
File "kivy/properties.pyx", line 498, in kivy.properties.Property.set
File "kivy/properties.pyx", line 527, in kivy.properties.Property.set
File "kivy/properties.pyx", line 2025, in kivy.properties.ColorProperty.convert