java.lang.RuntimeException: Unable to capture screenshot.

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java.lang.IllegalAccessException: Unable to create output dir: /storage/emulated/0/app_spoon-screenshots	at com.squareup.spoon.Spoon.createDir(Spoon.java:262)	at com.squareup.spoon.Spoon.createDir(Spoon.java:259)	at com.squareup.spoon.Spoon.createDir(Spoon.java:259)	at com.squareup.spoon.Spoon.filesDirectory(Spoon.java:224)	at com.squareup.spoon.Spoon.obtainScreenshotDirectory(Spoon.java:140)	at com.squareup.spoon.Spoon.screenshot(Spoon.java:78)	at junit.rules.ActivityTestRule$1.handle(ActivityTestRule.java:50)	at android.support.test.espresso.ViewInteraction.runSynchronouslyOnUiThread(ViewInteraction.java:184)	at android.support.test.espresso.ViewInteraction.check(ViewInteraction.java:158)	at com.spreaker.android.radio.main.MainActivityExploreTests.testExploreShouldHandleNetworkFailure(MainActivityExploreTests.java:139)	at java.lang.reflect.Method.invoke(Native Method)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)	at android.support.test.internal.statement.UiThreadStatement.evaluate(UiThreadStatement.java:55)	at android.support.test.rule.ActivityTestRule$ActivityStatement.evaluate(ActivityTestRule.java:257)	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)	at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)	at org.junit.rules.RunRules.evaluate(RunRules.java:20)	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.junit.runners.Suite.runChild(Suite.java:128)	at org.junit.runners.Suite.runChild(Suite.java:27)	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)	at org.junit.runner.JUnitCore.run(JUnitCore.java:115)	at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:54)	at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:240)	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1879)