Problem with error-bars

#!/usr/bin/env python3

# Corresponding document is at: https://cloud.datenzone.de/seafile/f/0c4e2d9acfad452190f4/?dl=1

# start using: soffice --accept="socket,host=localhost,port=2002;urp;" --norestore --nologo --nodefault --headless
import uno
import os


# get the uno component context from the PyUNO runtime
localContext = uno.getComponentContext()
# create the UnoUrlResolver
resolver =  localContext.ServiceManager.createInstanceWithContext("com.sun.star.bridge.UnoUrlResolver", localContext)
# connect to the running office
ctx = resolver.resolve("uno:socket,host=localhost,port=2002;urp;StarOffice.ComponentContext")
smgr = ctx.ServiceManager
# get the central desktop object
desktop = smgr.createInstanceWithContext( "com.sun.star.frame.Desktop",ctx)
url = uno.systemPathToFileUrl(os.path.abspath("errorbartest.ods"))
document = desktop.loadComponentFromURL(url, '_blank', 0, ())

# Here it gets interesting
sheets = document.getSheets()
sheetNames = sheets.getElementNames()
for i in sheetNames:
    # There should be only one sheet
    currentSheet = sheets.getByName(i)
    charts = currentSheet.getCharts()
    for c in charts:
        # There should be only one chart
        ranges = c.getRanges()
        for r in ranges:
            print("range: " + str(r))
        o = c.getEmbeddedObject()
        title = o.getTitle()
        print("Title: " + str(title.String))
        sequences = o.getDataSequences()
        for seq in sequences:
            values = seq.getValues()
            print("role: " + str(values.Role) + ", data: " + str(seq.getValues().getTextualData()))

'''
Current output:
range: (com.sun.star.table.CellRangeAddress){ Sheet = (short)0x0, StartColumn = (long)0x0, StartRow = (long)0x0, EndColumn = (long)0x2, EndRow = (long)0x1 }
Title: A test for error-bars
role: categories, data: ('First', 'Second')
role: values-y, data: ('30', '34')
'''