def get_perc_of_geo_info(dataframe):
    """
    Calculates the percentage of all tweets in the given dataframe that contain geo-info
    
    :param pd.Dataframe dataframe: Dataframe containing twitter data
    
    :return: Either string telling the error or integer telling the percentage
    
    """
    if 'is_geo' in dataframe:
        df_geo = dataframe[dataframe.is_geo == 1]
        if len(df_geo) > 0:
            return round(len(df_geo) / len(dataframe) * 100, 1)
        else:
            return 'No geographical Information in dataset'
    else:
        return 'No geographical Information in dataset'
