URGENT : Bot Error as output while running javascript

Hello everyone,

I have a requirement for merging the PDFs together, I have a data table containing the two columns (Invoice and Ref Doc Number) and a list containing some PDFs having Ref Doc Number as prefix and I have to merge the invoice with the PDFs having corresponding Ref Doc Number as prefix.

CATCH : A invoice can have multiple Ref Doc Number and a Ref Doc Number can have multiple PDFs.

I have created the input string for the given code containing the data table and the PDF list 

input_json = '{ "datatable" : [ { "Bill. Doc." : "1025294", "Ref. Doc." : "1022069792"}, { "Bill. Doc." : "54427960", "Ref. Doc." : "5750000117"}],

"pdf_list" : ["1022069792yoo","1022069792_test1","1022069792_test2","1022069792_test3","1022069792_test4","1022069792_test5","5750000117huugv","5750000117testtttt","5750000117_test11","5750000117_test2"]}' 

and i want the output in such a way I can merge the invoice and the PDF as mentioned above  

CODE : function generateInvoiceMapping(input_json) {
    let data = JSON.parse(input_json);
    let result = {};
    
    data.datatable.forEach(entry => {
        let invoice = entry["Bill. Doc."];
        let refDoc = entry["Ref. Doc."];
        
        if (!result[invoice]) {
            result[invoice] = {};
        }
        
        let matchingPdfs = data.pdf_list.filter(pdf => pdf.startsWith(refDoc));
        
        if (matchingPdfs.length > 0) {
            result[invoice][refDoc] = matchingPdfs;
        }
    });
    
    return JSON.stringify(result);
}

Output : {"1025294":{"1022069792":["1022069792yoo","1022069792_test1","1022069792_test2","1022069792_test3","1022069792_test4","1022069792_test5"]},"54427960":{"5750000117":["5750000117huugv","5750000117testtttt","5750000117_test11","5750000117_test2"]}}

ALWAYS GETTING OUTPUT AS ”Bot Error”, Although code is tunning fine in Visual Studio