Get error: IllegalArgumentException!

[xuanhien091]

java.lang.IllegalArgumentException: Illegal URL: at retrofit2.Retrofit$Builder.baseUrl(Retrofit.java:437) at com.shuf.phone.OpenVBX.getApiInstance(OpenVBX.java:110) at com.shuf.phone.OpenVBX.setEndpoint(OpenVBX.java:135) at com.shuf.phone.LoginActivity1$1.onClick(LoginActivity1.java:54) at android.view.View.performClick(View.java:4240) at android.view.View$PerformClick.run(View.java:17721) at android.os.Handler.handleCallback(Handler.java:730) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5103) 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:737) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method)