I think i had the same issue.
I had to modify the paths in wr_config.py

It was:

def __init__(self):
        # setup configuration
        self.config = ConfigParser(interpolation=None)
        self.config.optionxform = str
        # default values
        self.config.add_section('WeatherRadio')
        # web server configuration
        self.config.set('WeatherRadio', 'INDISERVER', '0.0.0.0')
        self.config.set('WeatherRadio', 'INDIPORT', '8624')

        # RRD storage holding time series data
        self.config.set('WeatherRadio', 'RRDFILE',
                        '/usr/local/share/weatherradio/weather.rrd')

        # RRD storage holding time series for raw sensor data
        self.config.set('WeatherRadio', 'RRDSENSORSFILE',
                        '/usr/local/share/weatherradio/sensors.rrd')
        # path to the JSON files holding the data
        self.config.set('WeatherRadio', 'DATAPATH',
                        '/usr/local/share/weatherradio/html/data')

        # path to the directory holding web cam images and videos
        self.config.set('WeatherRadio', 'MEDIADIR',
                        '/usr/local/share/weatherradio/html/media')

Edit do:
def __init__(self):
        # setup configuration
        self.config = ConfigParser(interpolation=None)
        self.config.optionxform = str
        # default values
        self.config.add_section('WeatherRadio')
        # web server configuration
        self.config.set('WeatherRadio', 'INDISERVER', 'localhost')
        self.config.set('WeatherRadio', 'INDIPORT', '7624')

        # RRD storage holding time series data
        self.config.set('WeatherRadio', 'RRDFILE',
                        '/usr/share/weatherradio/weather.rrd')

        # RRD storage holding time series for raw sensor data
        self.config.set('WeatherRadio', 'RRDSENSORSFILE',
                        '/usr/share/weatherradio/sensors.rrd')
        # path to the JSON files holding the data
        self.config.set('WeatherRadio', 'DATAPATH',
                        '/usr/share/weatherradio/html/data')

        # path to the directory holding web cam images and videos
        self.config.set('WeatherRadio', 'MEDIADIR',
                        '/usr/share/weatherradio/html/media')


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