Caused by: java.lang.IllegalStateException: Please login first!怎么解决

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1358)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5458)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)
Caused by: java.lang.IllegalStateException: Please login first!
at com.easemob.chat.core.i.a(Unknown Source)
at com.easemob.chat.EMConversationManager.getConversation(Unknown Source)
at com.easemob.chat.EMChatManager.getConversation(Unknown Source)
at com.yaya.tushu.activity.ChatActivity.setUpView(ChatActivity.java:760)
at com.yaya.tushu.activity.ChatActivity.onCreate(ChatActivity.java:290)
at android.app.Activity.performCreate(Activity.java:6323)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2385)
... 9 more