Error in Custom Script

Hi I am getting below error in my custom script I am sure it is related to syntax but I am not able to find the issue. Anybody idea?

Error:
SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

Code:

frappe.call({
        
        method: "library.update_items.fill_item_details",
        agrs: d1,
                callback: function(r) { }

        });

Regards
Ruchin Sharma

please check and validate the JSON data, you can validate the json at jsonline.com

Hi @makarand_b
Which JSON data you are talking about, I have no idea about it.

Regards
Ruchin Sharma

check the value of d1

@makarand_b
Sorry, I pasted wrong code but here is my actual code.
which is giving me the same error.

frappe.ui.form.on("Lead", "onload", function(frm, doctype, name)
{
frappe.call({
        method: "library.update_items.get_items_from_product",
            callback: function(r) {
                                $.each(r.message, function(i, item) {
                                var new_row1 = frm.add_child("pv_one_set_details");
                                new_row1.pv_one = item.set_name;
                                new_row1.quantity=0;
                                    });
                                
refresh_field("pv_one_set_details");
                                   }
});
});

Regards
Ruchin Sharna