index_sheet = 'sheet id here'
index_data = service.spreadsheets().get(spreadsheetId=index_sheet).execute()
fileinfo = index_data['sheets']
for i in range(len(fileinfo)):
    sheet_title = fileinfo[i]['properties']['title'].encode('utf-8')
    #error on the line below
    data = service.spreadsheets().values().get(spreadsheetId=index_sheet, range=sheet_title).execute()

googleapiclient.errors.HttpError: <HttpError 400 when requesting https://sheets.googleapis.com/v4/spreadsheets/sheet id here/values/bworksheet name here?alt=json returned "Unable to parse range: b'worksheet name here'">