title: gulp watch issue in sage 8.5.1
body: <p>I'm currently working on a site that is using Sage 8.5.1.</p>
  
  <p>I've done all of the following:</p>
  
  <ol>
  <li>Install gulp and Bower globally with <code>npm install -g gulp bower</code></li>
  <li>Navigate to the theme directory and run <code>npm install</code></li>
  <li>Run <code>bower install</code></li>
  </ol>
  
  <p><strong>But when I run gulp watch, I get the following issue:</strong></p>
  
  <pre><code>gulp watch[8188]: ../src/node_contextify.cc:633:static void node::contextify::ContextifyScript::New(const FunctionCallbackInfo&lt;v8::Value&gt; &amp;): Assertion `args[1]-&gt;IsString()' failed.
   1: 0x10003b125 node::Abort() [/usr/local/bin/node]
   2: 0x10003a183 node::AddEnvironmentCleanupHook(v8::Isolate*, void (*)(void*), void*) [/usr/local/bin/node]
   3: 0x100064bc1 node::contextify::ContextifyScript::New(v8::FunctionCallbackInfo&lt;v8::Value&gt; const&amp;) [/usr/local/bin/node]
   4: 0x10023122f v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo*) [/usr/local/bin/node]
   5: 0x1002303cb v8::internal::MaybeHandle&lt;v8::internal::Object&gt; v8::internal::(anonymous namespace)::HandleApiCallHelper&lt;true&gt;(v8::internal::Isolate*, v8::internal::Handle&lt;v8::internal::HeapObject&gt;, v8::internal::Handle&lt;v8::internal::HeapObject&gt;, v8::internal::Handle&lt;v8::internal::FunctionTemplateInfo&gt;, v8::internal::Handle&lt;v8::internal::Object&gt;, v8::internal::BuiltinArguments) [/usr/local/bin/node]
   6: 0x10022fde7 v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/usr/local/bin/node]
   7: 0x22e57615be3d 
  Abort trap: 6
  </code></pre>
  
  <p>Any suggestions?</p>