closure-templates: Cannot read property 'assertType' of undefined when using soyutils.js on soy generated by compileToJsSrc

Take the following template :

/**
 * 
 */
{template .root}
	{@param convention: string}
	<!-- ko bindchildren: false -->
		<div class="shimTimePicker">{$convention}</div>
	<!-- /ko -->
{/template}

This template produce this JavaScript file output :

if (typeof eca == 'undefined') { var eca = {}; }
if (typeof eca.templates == 'undefined') { eca.templates = {}; }
if (typeof eca.templates.timepicker == 'undefined') { eca.templates.timepicker = {}; }

eca.templates.timepicker.root = function(opt_data, opt_ignored, opt_ijData) {
  soy.asserts.assertType(goog.isString(opt_data.convention) || (opt_data.convention instanceof goog.soy.data.SanitizedContent), 'convention', opt_data.convention, 'string|goog.soy.data.SanitizedContent');
  var convention = /** @type {string|goog.soy.data.SanitizedContent} */ (opt_data.convention);
  return soydata.VERY_UNSAFE.ordainSanitizedHtml('<!-- ko bindchildren: false --><div class="timepicker hidden' + ((convention != 'oc_na') ? ' notam' : '') + '" data-bind="css: {hidden: !visible()}"><div data-bind="foreach: times"><div class="row" data-bind="click:$parent.select, class:classes"><div class="container"><div class="time"><!-- ko ifnot: $parent.delcol() --><span data-bind="text:displayHour()"></span>:<span data-bind="text:displayMinute()"></span>&nbsp;<span data-bind="text:ampm"></span><!-- /ko --><!-- ko if: $parent.delcol() --><span data-bind="text: delcolTimeSlotDisplay"></span><!-- /ko --></div><div class="info" data-bind="text:info"></div><div class="spacer"></div></div></div></div></div><div class="shimTimePicker"></div><!-- /ko -->');
};
if (goog.DEBUG) {
  eca.templates.timepicker.root.soyTemplateName = 'eca.templates.timepicker.root';
}

But I am getting this error : Cannot read property ‘assertType’ of undefined

I am using the soy-2016-08-25 Maven dependency and the latest version of closure-templates-for-javascript via :

soyutils.js

In soyutils.js I cannot find this function : soy.asserts.assertType(...)

Also I am using jQuery 1.7.2 and latest version of KnockoutJS.

Please could you help me with this ? What I am doing wrong ?

Remarks : I am trying to move from the first version of closure template ‘1.0’ to the latest. I have no errors in my Java side.

On the Java side, here is my code to generate Js from Soy File :

final SoyFileSet soyFileSet = SoyFileSet.builder().add(preparedContent, resource.getName()).add(commonPrepared, common.getName()).build();
if ("soy".equals(type)) {
	tofus.put(tofuKey, new SoyTofuOrJavaScript(soyFileSet.compileToTofu()));
} else if ("js".equals(type)) {
	final SoyJsSrcOptions jsOpt = new SoyJsSrcOptions();
	tofus.put(tofuKey, new SoyTofuOrJavaScript(Joiner.on(';').join(soyFileSet.compileToJsSrc(jsOpt, null))));
}

And to render it :

if (Arrays.asList(NEED_CONTENTKIND_JS).contains(templateName)) {
	return renderer.setData(data).setContentKind(ContentKind.JS).render();
} else {
	return renderer.setData(data).render();
}

Thank you very much. Best regards.