无法找到文件，导致app无法运行

E/AndroidRuntime: FATAL EXCEPTION: main
                  java.lang.NoClassDefFoundError: cn.jpush.android.api.e
                      at cn.jpush.android.api.JPushInterface.<clinit>(Unknown Source)
                      at com.ruisk.caifuyun.application.ZhangFuBaoApplication.onCreate(ZhangFuBaoApplication.java:52)
                      at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1007)
                      at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4570)
                      at android.app.ActivityThread.access$1300(ActivityThread.java:147)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1332)
                      at android.os.Handler.dispatchMessage(Handler.java:99)
                      at android.os.Looper.loop(Looper.java:137)
                      at android.app.ActivityThread.main(ActivityThread.java:5265)
                      at java.lang.reflect.Method.invokeNative(Native Method)
                      at java.lang.reflect.Method.invoke(Method.java:525)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:760)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
                      at dalvik.system.NativeStart.main(Native Method)