use jacoco, i get this error:

D/JacocoRunner( 1737): endCoverage started!
D/JacocoRunner( 1737): java.lang.reflect.InvocationTargetException
D/JacocoRunner( 1737): java.lang.reflect.InvocationTargetException
D/JacocoRunner( 1737):  at java.lang.reflect.Method.invokeNative(Native Method)
D/JacocoRunner( 1737):  at java.lang.reflect.Method.invoke(Method.java:525)
D/JacocoRunner( 1737):  at 
com.alanjeon.testing.JacocoRunner.endCoverage(JacocoRunner.java:60)
D/JacocoRunner( 1737):  at 
com.alanjeon.testing.JacocoRunner.finish(JacocoRunner.java:93)
D/JacocoRunner( 1737):  at 
com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner$BridgeTestRunner.finish(GoogleInstrumentationTestRunner.java:264)
D/JacocoRunner( 1737):  at 
android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:574)
D/JacocoRunner( 1737):  at 
com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner.onStart(GoogleInstrumentationTestRunner.java:167)
D/JacocoRunner( 1737):  at 
com.alanjeon.testing.JacocoRunner.onStart(JacocoRunner.java:87)
D/JacocoRunner( 1737):  at 
android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)
D/JacocoRunner( 1737): Caused by: java.lang.IllegalStateException: JaCoCo agent 
not started.
D/JacocoRunner( 1737):  at 
org.jacoco.agent.rt.internal_932a715.Agent.getInstance(Agent.java:72)
D/JacocoRunner( 1737):  at org.jacoco.agent.rt.RT.getAgent(RT.java:32)
D/JacocoRunner( 1737):  ... 9 more
I/GoogleInstr( 1737): Activities that are still in CREATED to PAUSED: 0
this is my code

OutputStream out = null;
        try {
            out = new 
FileOutputStream(getCoverageFilePath(getTargetContext().getPackageName()), 
false);
            Object agent = 
Class.forName("org.jacoco.agent.rt.RT").getMethod("getAgent").invoke(null);

            out.write((byte[]) agent.getClass().getMethod("getExecutionData", 
boolean.class).invoke(agent, false));

        } catch (Exception e) {
            Log.d(TAG, e.toString(), e);
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

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