Getting error on using new code base for ITM price selection

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1

My Script is throwing error for ITM price selection of NIFTY, SESEX

Python version - Python 3.8.0
Dhan-Tradehull - 3.1.2

Code - itm_ce_name, itm_pe_name, itm_ce_strike, itm_pe_strike = tsl.ITM_Strike_Selection(
Underlying=‘NIFTY’,
Expiry=0,
ITM_count=2
)

Error

“NIFTY
Exception at getting Expiry list as {‘status’: ‘failure’, ‘remarks’: ‘Expecting value: line 1 column 1 (char 0)’, ‘data’: ‘’}
Unable to find the correct Expiry for NIFTY
Error: cannot unpack non-iterable NoneType object”