How to fix this javascript error?

See more:

Javascript

JSP

I want to create a Name popup function, where the user will click the name textbox and popover will ask for more validation.

This is the code:

<form class='form'>
  <div class='controls'>
    <% var compiled =  _.reduce(items, function(str, v, k){
       v["name"] = k;
      return str + popoverTemplates[v["type"]]*(v);
     }, ""); %>
    <%= compiled %>
    <hr/>
    <button id="save" class='btn btn-info'>Save</button><button id="cancel" class='btn btn-danger'>Cancel</button>
  </div>
</form>

The errors come from this line: }, "")
Error on comma says: Syntax error on token "," invalid (
Error on bracket says: Syntax error, insert AssignmentOperator Expression to complete expression