quest_order_record = zoho.crm.getRecordById("Quest_Orders", ID, "mycustom");// info rec;

doctor_name = quest_order_record.get("Doctor_Name1"); info doctor_name;

mp = Map();

mp.put("Doctor_Name1", 4594870000020569119); info mp;

update = zoho.crm.updateRecord("Quest_Orders", ID, "mycustom", mp ); info update;

getting this error in screenshot 

mycustom is the connection name (without this it gives error for no permission)

Pls let me know if need any other details.