getting "{'message': 'Internal Error', 'errorcode': 'AB2001', 'status': False, 'data': None}" error

[ganesh6773micro]

getting the error msg posted above with historical data with getCandleData

def getHistoricalData(token=15110, interval='ONE_MINUTE'):
    
    ltp = obj.ltpData('NSE', 'TATAMOTORS-EQ', 3456)
    print(ltp)
    
    todate = datetime.now()
    fromDate = todate - timedelta(days=1)
    
    fromDateFrmt = fromDate.strftime('%Y-%m-%d 09:20')
    todateDateFrmt = fromDate.strftime('%Y-%m-%d %H:%M')
    print(fromDateFrmt, todateDateFrmt)
#     print(userProfile)
    try:
        histParams = {
            'exchange': 'NSE',
            'symboltoken': "3456",
            'interval': interval,
            'fromdate': fromDateFrmt,
            'toDate': todateDateFrmt
        }
        histCandleJson = obj.getCandleData(histParams)
        print(histCandleJson)
    except Exception as ex:
        print(ex)
        
getHistoricalData()

output

{'status': True, 'message': 'SUCCESS', 'errorcode': '', 'data': {'exchange': 'NSE', 'tradingsymbol': 'TATAMOTORS-EQ', 'symboltoken': '3456', 'open': 466.55, 'high': 478.0, 'low': 462.25, 'close': 461.45, 'ltp': 467.1}}
2021-11-29 09:20 2021-11-29 12:24

{'message': 'Internal Error', 'errorcode': 'AB2001', 'status': False, 'data': None}

[ganesh6773micro]

any idea what I am doing wrong ?