Javascript error when trying to add file

After I select a file by clicking on Browse Button, I am getting following javascript error:

VM1615:1 Uncaught SyntaxError: Unexpected token { in JSON at position 336success @ ultimate-importer-free.js?ver=4.5.3:6i

Now the next button doesn’t enable at all.

It was working fine in my system till now. I am using Chrome Browser.

I have minification enabled so cannot tell the exact place but it should be somewhere over here:

success: function(data) {
                var fileobj = JSON.parse(data);
                jQuery.each(fileobj, function(objkey, objval) {
                    jQuery.each(objval, function(o_key, file) {
                        document.getElementById('uploadFileName').value = file.name;
                        var filewithmodule = file.uploadedname.split(".");
                        var check_file = filewithmodule[filewithmodule.length - 1];
                        if (check_file != "csv" && check_file != "txt") {
                            alert(wp_ultimate_translate_importer.fileformatmsg);
                            return false;
                        }

I cleared all my cache but no success.

https://www.ads-software.com/plugins/wp-ultimate-csv-importer/