java.lang.NullPointerException

[Amab]

java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:2154)
at android.view.View.performClick(View.java:2538)
at android.view.View$PerformClick.run(View.java:9152)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at android.view.View$1.onClick(View.java:2149)
... 11 more
Caused by: java.lang.NullPointerException
at java.io.StringReader.<init>(StringReader.java:46)
at android.text.HtmlToSpannedConverter.convert(Html.java:411)
at android.text.Html.fromHtml(Html.java:139)
at android.text.Html.fromHtml(Html.java:102)
at es.ugr.swad.swadroid.modules.tests.CheckedAnswersArrayAdapter.getView(CheckedAnswersArrayAdapter.java:118)
at es.ugr.swad.swadroid.modules.tests.TestsMake.showQuestion(TestsMake.java:404)
at es.ugr.swad.swadroid.modules.tests.TestsMake.showTest(TestsMake.java:577)
at es.ugr.swad.swadroid.modules.tests.TestsMake.onShowResultsDetailsClick(TestsMake.java:666)
... 14 more