Unhandled rejection TypeError: /var/www/hexo/themes/hexo-theme-material/layout/index.ejs:3

[ghost]

• 与主题配置有关的config：

# Extensions
## Plugins: https://hexo.io/plugins/
## Themes: https://hexo.io/themes/
theme: hexo-theme-material

• 当我执行hexo serve后，并访问站点得到了如下报错：

INFO  Start processing
INFO  Hexo is running at http://localhost:4000/. Press Ctrl+C to stop.
Unhandled rejection TypeError: /var/www/hexo/themes/hexo-theme-material/layout/index.ejs:3
    1| <!-- Index Module -->
    2| <div class="demo-blog__posts mdl-grid">
 >> 3|     <%- partial("_partial/daily_pic") %>
    4|     <%- partial("_partial/blog_info") %>
    5|     
    6|     <% page.posts.each(function(post) { %>

/var/www/hexo/themes/hexo-theme-material/layout/_partial/daily_pic.ejs:5
    3|     
    4|     <!-- Pic & Slogan -->
 >> 5|     <div class="mdl-card__media mdl-color-text--grey-50" style="background-image:url(<%= theme.img.daily_pic %>)">
    6|         <p class="index-top-block-slogan"><a href="<%= theme.url.logo %>"><%= theme.uiux.slogan %></a></p>
    7|     </div>
    8| 

Cannot read property 'daily_pic' of undefined
    at eval (eval at <anonymous> (/var/www/hexo/node_modules/ejs/lib/ejs.js:242:14), <anonymous>:30:264)
    at eval (eval at <anonymous> (/var/www/hexo/node_modules/ejs/lib/ejs.js:242:14), <anonymous>:30:907)
    at /var/www/hexo/node_modules/ejs/lib/ejs.js:255:15
    at _compiledSync (/var/www/hexo/node_modules/hexo/lib/theme/view.js:122:20)
    at View.renderSync (/var/www/hexo/node_modules/hexo/lib/theme/view.js:50:21)
    at Object.partial (/var/www/hexo/node_modules/hexo/lib/plugins/helper/partial.js:42:17)
    at Object.wrapper (/var/www/hexo/node_modules/lodash/lodash.js:4921:19)
    at eval (eval at <anonymous> (/var/www/hexo/node_modules/ejs/lib/ejs.js:242:14), <anonymous>:30:103)
    at eval (eval at <anonymous> (/var/www/hexo/node_modules/ejs/lib/ejs.js:242:14), <anonymous>:36:175)
    at /var/www/hexo/node_modules/ejs/lib/ejs.js:255:15
    at _compiled (/var/www/hexo/node_modules/hexo/lib/theme/view.js:127:30)
    at View.render (/var/www/hexo/node_modules/hexo/lib/theme/view.js:29:15)
    at /var/www/hexo/node_modules/hexo/lib/hexo/index.js:387:25
    at tryCatcher (/var/www/hexo/node_modules/bluebird/js/release/util.js:16:23)
    at /var/www/hexo/node_modules/bluebird/js/release/method.js:15:34
    at RouteStream._read (/var/www/hexo/node_modules/hexo/lib/hexo/router.js:134:3)
    at RouteStream.Readable.read (_stream_readable.js:348:10)
    at resume_ (_stream_readable.js:737:12)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)