Frappe Client Insert into Doctype issue

Frappe Framework Customization
1

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I have got this error when I tried to insert data into target server doctype.

MY CODE (Simplified):

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ps. My code has more than 100+ parameters but i removed them for easy display here.
Can anyone help me with the error : ValueError: No JSON object could be decoded
Could it be my HTML passing some non-acceptable value to frappe?