eclipse 编写 scala 报错

在eclipse中编写scala代码，在输入 . 或者alt+l是报如下错误

An internal error ourred during: "Computing additional info"

具体内容

An internal error ourred during: “Computing additional info”.
.eclipse.jdt.internal.core.SearchableEnvironment.(L/eclipse/jdt/internal/core/JavaProject;L/eclipse/jdt/core/WorkingCopyOwner;)V

解决方法：
Window ——> Preferences ——> Java ——> Editor ——> Advanced

取消图中两个选项的勾选
保存更改
完美解决