为什么会出现此错误？ Please see the Image
[17:10:04] Using gulpfile ~\Desktop\CPIC.UI.Web\gulpfile.js
[17:10:04] Starting 'run-e2e-tests'...
[17:10:04] log file
[17:10:04] Starting nightwatch...
[CPIC E2e Test] Test Suite
==========================
Running: CPIC integration
Error retrieving a new session from the selenium server
Error: connect ECONNREFUSED 127.0.0.1:4444
at Object.exports._errnoException (util.js:874:11)
at exports._exceptionWithHostPort (util.js:897:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1063:14)
Connection refused! Is selenium server started?
[17:10:06] 'run-e2e-tests' errored after 1.5 s
[17:10:06] Error in plugin 'gulp-nightwatch'
Message:
nightwatch exited with code 1
答案 0 :(得分：1)
您在课前缺少逗号
<div class="form-group">
<%= f.label :category %><br />
<%= f.select :category_id, Category.all.collect {|x| [x.name, x.id]}, {:include_blank => 'Select One'}, class:'form-control' %><br /> <br />
</div>