JavaScript is not being loaded and getting error "there was an error with this fields customized event"

I am getting error, that my JS is not loaded:

This function is not being loaded on the page, as you can see error message. I am having difficulty to understand, why my JS is not being loaded:

function filterleadContacts() {

    debugger;

    var LeadId = Xrm.Page.getAttribute("seda_lead").getValue();

    alert(LeadId);

    //filter LookUp BoothService

    if (IsFieldExistsOnForm("seda_lead")) {

        if (!IsLookUpEmpty("seda_lead")) {

            EnableField("primarycontactid");

            Xrm.Page.getControl("primarycontactid").addPreSearch(function () {

                addLeadCustomFilterLookUp(LeadId);

            }

            );

        }

    }

    else { HideField("primarycontactid");  }

}

// Method Description: Filter Function attached to filterBoothServices function

function addLeadCustomFilterLookUp(param_LeadId)

{

    debugger;

    try {

        if (param_LeadId != null && param_LeadId != undefined) {

            //alert('Lead ID Value: ' + param_LeadId);

            //alert('Dekh Yaaar: ' + GetOptionSetValue("seda_lead"));

            var Acct = Xrm.Page.getAttribute("seda_casetypec");

                                                var obj = Xrm.Page.getAttribute("seda_lead");

                                                alert("Lead Value Checking: " + obj);

            alert("Uzwa Checking: " + Acct);

            var filter = "<filter type='and'>" +

                "<condition attribute='seda_lead' operator='eq' value='" + param_LeadId + "'/>" +

              "</filter>";

            //filter booth services based on the booth selected in participant screen

            Xrm.Page.getControl("primarycontactid").addCustomFilter(filter);

Xrm.Page.getControl("primarycontactid").addPreSearch(function () {

                      Xrm.Page.getControl("primarycontactid").addCustomFilter(filter);

        }

    }

    catch (e) {

        throw new Error(e.message);

    }

}