import - how to fix `Type mismatch: cannot convert from android.app.FragmentManager to android.support.v4.app.FragmentManager` error in android? -

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मुझे निम्न त्रुटि हो रही है 

  प्रकार बेमेल: एंड्रॉइड.एप से परिवर्तित नहीं किया जा सकता। FragmentManager को एंड्रॉइड। Support.v4.app.FragmentManager   
 निम्न पंक्ति के लिए  
  फ्रेगमेंट मैनेजर frgManager = getFragmentManager (); frgManager.beginTransaction ()। प्रतिस्थापन (R.id.content_frame, fragment) .commit ()   
 मेरी कक्षा में निम्नलिखित आयात हैं  
  import android.support.v4.app.Fragment; आयात करें android.support.v4.app.FragmentManager; आयात करें android.support.v4.app.FragmentTransaction;   
 त्रुटि कैसे ठीक करें?   
 
 
 बदलें   getSupportFragmentManager ()  के साथ getFragmentManager () , और सुनिश्चित करें कि आपका वर्ग  फ्रेग्मेंट एक्टिविटी  का उपवर्ग है।

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