运行不起来

[luoyechendian]

编译后运行，提示以下内容：
2019/05/23 16:38:17.862 [E] [template.go:176] parse template err: article-detail.tpl template: article-detail.tpl:29: function "avatar" not defined
2019/05/23 16:38:17.884 [W] [beego.go:103] template: article-detail.tpl:29: function "avatar" not defined
panic: template: article-detail.tpl:29: function "avatar" not defined