Error loading /config/configuration.yaml: while scanning for the next token
found character '\t' that cannot start any token
in "/config/sensor/energy_usage_light.yaml", line 7, column 1
You indented the line using a tab instead of spaces. I suspect it may be the first of several lines that use tabs for indenting. You’ll need to delete the tabs and replace them with spaces. You can’t use tabs to indent YAML code.
I don’t know which text editor you are using but several have a means of displaying whitespace characters such as space, tab, etc thereby making it easier to detect what is being used to create the indentation.