java.lang.ClassNotFoundException，尽管该类存在

Question

我得到java.lang.ClassNotFoundException：

Exception in thread "main" java.lang.NoClassDefFoundError: Consts/SortOfPages
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
    at java.lang.Class.getMethod0(Unknown Source)
    at java.lang.Class.getMethod(Unknown Source)
    at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: Consts.SortOfPages
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 6 more

这是SortOfPages类：

package Consts;

public enum SortOfPages {
    POPUP("New - "),
    SILENT("Silent - ");

    public String description;

    private SortOfPages(String description) {
        this.description = description;
    }

    public String getDescription() {
        return description;
    }
}

导入主类：

import Consts.SortOfPages;

但是当我搜索Const / SortOfPages时，我发现它，并且它存在。

我尝试清理，再次构建 - 同样。

我该如何解决？