Approval getting "Update failed" errors from portal for one user

[Kanna12]

Hello Every one,

My Manager not able to approve the any requests from the portal, even though he have "approva_user " role assigned.
I checked for another managers, they are able to approve successfully from portal. I am not sure why only one person not able approve if he have required roles. I checked in Approval info widget as well.

Please find below script:

(function() {

    data.actionPreventedMsg = gs.getMessage("Update failed");

    var gr = $sp.getRecord();

    if (gr == null || !gr.isValid()) {

        data.isValid = false;

        return;

    }

    data.isValid = true;

    data.isMine = isApprovalMine(gr);

    var userApprovalAccess = gs.hasRole("approval_admin") || (gs.hasRole("approver_user") && data.isMine);

    var approverDisplay = gr.approver.getDisplayValue();

    if (!data.isMine && approverDisplay)

        data.approverDisplay = approverDisplay;

    if (approverDisplay) {

        data.approvedMsg = gs.getMessage("Approved by {0}", approverDisplay);

        data.rejectedMsg = gs.getMessage("Rejected by {0}", approverDisplay);

    } else {

        data.approvedMsg = gs.getMessage("Approved");

        data.rejectedMsg = gs.getMessage("Rejected");

    }

    if (input && input.op && userApprovalAccess) {

        gr.state = input.op;

        data.updateID = gr.update();

        if (GlideStringUtil.nil(data.updateID)) {

            // update failed so fetch again for correct values

            gr = $sp.getRecord();

        }

        data.op = "";

    }

    var fields = $sp.getFields(gr, 'state,sys_created_on');

    if (gr.sys_mod_count > 0)

        fields.push($sp.getField(gr, 'sys_updated_on'));

    data.fields = fields;

    data.state = gr.state.toString();

    data.sys_updated_on = gr.sys_updated_on.toString();

    data.sys_id = gr.getUniqueValue();

    data.table = gr.getTableName();

    var record = getRecordBeingApproved(gr);

    data.label = record.getLabel();

    data.approvedStatusMsg = gs.getMessage("{0} has been approved", record.number);

    data.esignature = {

        username:  gs.getUserName(),

        userSysId: gs.getUserID(),

        e_sig_required: checkESig(gr)

};

Any inputs on this please.

    function checkESig(approvalGR) {

        var esigRegistryGR = new GlideRecord("e_signature_registry");

        if (!esigRegistryGR.isValid())

            return false;

        var table = approvalGR.getValue("source_table");

        if (!table)

            table = approvalGR.sysapproval.sys_class_name;

        if (!table)

            return false;

        esigRegistryGR.addQuery("enabled", "true");

        esigRegistryGR.addQuery("table_name", table);

        esigRegistryGR.query();

        return esigRegistryGR.hasNext();

    }

    function getRecordBeingApproved(gr) {

        if (!gr.sysapproval.nil())

            return gr.sysapproval.getRefRecord();

        return gr.document_id.getRefRecord();

    }

})();