Android: “Path for project must have only one segment”

I found the cause of the problem:

It turns out that when I specified the (only) Launch configuration for the project (Properties > Run/Debug Settings), I forgot to specify the Project name

android:theme="@android:style/Theme.Dialog"   将一个Activity显示为能话框模式 
android:theme="@android:style/Theme.NoTitleBar"  不显示应用程序标题栏 
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"  不显示应用程序标题栏，并全屏 
android:theme="Theme.Light"  背景为白色 
android:theme="Theme.Light.NoTitleBar"  白色背景并无标题栏 
android:theme="Theme.Light.NoTitleBar.Fullscreen"  白色背景，无标题栏，全屏 
android:theme="Theme.Black"  背景黑色 
android:theme="Theme.Black.NoTitleBar"  黑色背景并无标题栏 
android:theme="Theme.Black.NoTitleBar.Fullscreen"    黑色背景，无标题栏，全屏 
android:theme="Theme.Wallpaper"  用系统桌面为应用程序背景 
android:theme="Theme.Wallpaper.NoTitleBar"  用系统桌面为应用程序背景，且无标题栏 
android:theme="Theme.Wallpaper.NoTitleBar.Fullscreen"  用系统桌面为应用程序背景，无标题栏，全屏 
android:theme="Translucent" 
android:theme="Theme.Translucent.NoTitleBar" 
android:theme="Theme.Translucent.NoTitleBar.Fullscreen" 
android:theme="Theme.Panel" 
android:theme="Theme.Light.Panel"