Error in inflating class fragment after sending app in background and reopening

My app works fine when used first time. But when I send it in background for a long and reopening its showing error in inflating class fragment. I did google found that its because of inflating a fragment without UI but I am able to resolve the problem. My logcat is as follow

09-03 11:34:22.702: E/Crittercism(19815): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hundredpercentile.vidyamandirclasses/com.hundredpercentile.vidyamandirclasses.test_engine.activity.TestSectionActivity}: android.view.InflateException: Binary XML file line #91: Error inflating class fragment
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2198)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.ActivityThread.access$800(ActivityThread.java:139)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
09-03 11:34:22.702: E/Crittercism(19815):   at android.os.Handler.dispatchMessage(Handler.java:102)
09-03 11:34:22.702: E/Crittercism(19815):   at android.os.Looper.loop(Looper.java:136)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.ActivityThread.main(ActivityThread.java:5086)
09-03 11:34:22.702: E/Crittercism(19815):   at java.lang.reflect.Method.invoke(Native Method)
09-03 11:34:22.702: E/Crittercism(19815):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
09-03 11:34:22.702: E/Crittercism(19815):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
09-03 11:34:22.702: E/Crittercism(19815): Caused by: android.view.InflateException: Binary XML file line #91: Error inflating class fragment
09-03 11:34:22.702: E/Crittercism(19815):   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
09-03 11:34:22.702: E/Crittercism(19815):   at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
09-03 11:34:22.702: E/Crittercism(19815):   at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
09-03 11:34:22.702: E/Crittercism(19815):   at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
09-03 11:34:22.702: E/Crittercism(19815):   at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
09-03 11:34:22.702: E/Crittercism(19815):   at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
09-03 11:34:22.702: E/Crittercism(19815):   at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.Activity.setContentView(Activity.java:1937)
09-03 11:34:22.702: E/Crittercism(19815):   at com.hundredpercentile.vidyamandirclasses.test_engine.activity.TestSectionActivity.onCreate(TestSectionActivity.java:151)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.Activity.performCreate(Activity.java:5248)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162)
09-03 11:34:22.702: E/Crittercism(19815):   ... 9 more
09-03 11:34:22.702: E/Crittercism(19815): Caused by: java.lang.IllegalStateException: Fragment com.hundredpercentile.vidyamandirclasses.test_engine.fragment.TestEngineQuestionFragment did not create a view.
09-03 11:34:22.702: E/Crittercism(19815):   at android.app.Activity.onCreateView(Activity.java:4826)
09-03 11:34:22.702: E/Crittercism(19815):   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
09-03 11:34:22.702: E/Crittercism(19815):   ... 20 more

My activity inflate fragment using class in XML

<fragment
            android:id="@+id/view_test_section"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/view_header"
            class="package.Fragment"
            android:background="@color/white" />