Error in the app: java.lang.IllegalArgumentException: No containing triangle

Indoor Location
1

Hi there
i´m testing my app but, I happen the next mistake:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.estimote.indoorapp/com.estimote.indoorapp.MainActivity}: java.lang.IllegalArgumentException: No containing triangle
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2822)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2900)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1611)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6651)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:810)
     Caused by: java.lang.IllegalArgumentException: No containing triangle
        at com.estimote.indoorsdk_module.algorithm.g.f.b(Unknown Source:28)
        at com.estimote.indoorsdk_module.algorithm.g.g.a(Unknown Source:24)
        at com.estimote.indoorsdk_module.algorithm.g.g.a(Unknown Source:41)
        at com.estimote.indoorsdk_module.b.b.q.a(Unknown Source:7)
        at com.estimote.indoorsdk_module.b.b.w.a(Unknown Source:10)
        at com.estimote.indoorsdk_module.b.b.w.get(Unknown Source:0)
        at dagger.internal.DoubleCheck.get(DoubleCheck.java:47)
        at com.estimote.indoorsdk_module.b.b.af.a(Unknown Source:44)
        at com.estimote.indoorsdk_module.b.b.af.get(Unknown Source:0)
        at dagger.internal.DoubleCheck.get(DoubleCheck.java:47)
        at com.estimote.indoorsdk_module.algorithm.b.a(Unknown Source:4)
        at com.estimote.indoorsdk_module.algorithm.b.injectMembers(Unknown Source:2)
        at com.estimote.indoorsdk_module.b.b.k.a(Unknown Source:2)
        at com.estimote.indoorsdk_module.algorithm.IndoorLocationManagerFactory.create(Unknown Source:99)
        at com.estimote.indoorsdk_module.algorithm.IndoorLocationManagerFactory.create$default(Unknown Source:13)
        at com.estimote.indoorsdk.DefaultForegroundScannerBuilder.build(DefaultForegroundScannerBuilder.kt:27)
        at com.estimote.indoorapp.MainActivity.onCreate(MainActivity.kt:96)
        at android.app.Activity.performCreate(Activity.java:7028)
        at android.app.Activity.performCreate(Activity.java:7019)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1215)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2775)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2900) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1611) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6651) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:810)

why is that? help me please.