boolean is not a function in javascript

I have the following javascript where I am reading in a word and writing out a translation, but I keep getting the error boolean is not a function

function translate() {
var word = $("#prodId").val();

$.getJSON("api/translation?word=" + word,
            function (data) {

                $("#word").text(data.TranslatedWord);
            })
            .fail(
                function (jqXHR, textStatus, err) {
                    $("#word").text('Error: ' + err);
                });
                    }

The following method which is basically the same thing, but uses an integer works fine:

function find() {
       var id = $("#prodId").val();
       $.getJSON("api/products/" + id,
            function (data) {
                var str = data.Name + ': $' + data.Price;
                $("#product").text(str);
            })
            .fail(
                function (jqXHR, textStatus, err) {
                    $("#product").text('Error: ' + err);
                });
                    }

Here is a snippet of the HTML:

<div id="body">
    <div class="main-content">
        <div>
            <h1>All Products</h1>
            <ul id="products" />
        </div>
        <div>
        <label for="prodId">ID:</label>
        <input type="text" id="prodId" />
        <input type="button" value="Translate" onclick="translate();" />
        <p id="word" />
        </div>
    </div>
</div>

<script type="text/javascript">
$(document).ready(function () {
    // Send an AJAX request
    $.getJSON("api/products/",
              function (data) {
                  // On success, 'data' contains a list of products.
                  $.each(data, function (key, val) {

                      // Format the text to display.
                      var str = val.Name + ': $' + val.Price;

                      // Add a list item for the product.
                      $('<li/>', { text: str })
                      .appendTo($('#products'));

                  });

              });

});

    function find() {
        var id = $("#prodId").val();
        $.getJSON("api/products/" + id,
                  function (data) {
                      var str = data.Name + ': $' + data.Price;
                      $("#product").text(str);
                  })
        .fail(
            function (jqXHR, textStatus, err) {
                $("#product").text('Error: ' + err);
            });
    }

    function translate() {
        var word = $("#prodId").val();

        $.getJSON("api/translation?word=" + word,
                  function (data) {

                      $("#word").text(data.TranslatedWord);
                  })
        .fail(
            function (jqXHR, textStatus, err) {
                console.log(err);

                $("#word").text('Error: ' + err);
            });
    }




</script>