java.lang.RuntimeException：无法实例化活动ComponentInfo {...}：java.lang.ClassNotFoundException：未找到类

I am developing an app using Fused Location Provider. I am getting an error "Unfortunately, appname has stopped" when i attempt to run the program. Eclipse doesnt show that there are any mistakes but there are errors in the logcat. I dont know how to fix them. I downloaded source code I am developing an app using Fused Location Pro