facebook - Android : FragmentManager is already executing transactions -


i trying implement logging facebook, when 1 authentifiate have error : 

java.lang.illegalstateexception: fragmentmanager executing transactions                                                                  @ android.support.v4.app.fragmentmanagerimpl.ensureexecready(fragmentmanager.java:1956)                                                                  @ android.support.v4.app.fragmentmanagerimpl.execpendingactions(fragmentmanager.java:2007)                                                                  @ android.support.v4.app.fragmentmanagerimpl.executependingtransactions(fragmentmanager.java:763)                                                                  @ android.support.v4.app.fragmenttabhost.onattachedtowindow(fragmenttabhost.java:289)                                                                  @ android.view.view.dispatchattachedtowindow(view.java:14514)                                                                  @ android.view.viewgroup.dispatchattachedtowindow(viewgroup.java:2836)                                                                  @ android.view.viewgroup.addviewinner(viewgroup.java:4348)                                                                  @ android.view.viewgroup.addview(viewgroup.java:4145)                                                                  @ android.view.viewgroup.addview(viewgroup.java:4086)                                                                  @ android.view.viewgroup.addview(viewgroup.java:4059)                                                                  @ android.support.v4.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:1309)                                                                  @ android.support.v4.app.fragmentmanagerimpl.movefragmenttoexpectedstate(fragmentmanager.java:1528)                                                                  @ android.support.v4.app.fragmentmanagerimpl.movetostate(fragmentmanager.java:1595)                                                                  @ android.support.v4.app.backstackrecord.executeops(backstackrecord.java:758)                                                                  @ android.support.v4.app.fragmentmanagerimpl.executeops(fragmentmanager.java:2363)                                                                  @ android.support.v4.app.fragmentmanagerimpl.executeopstogether(fragmentmanager.java:2149)                                                                  @ android.support.v4.app.fragmentmanagerimpl.optimizeandexecuteops(fragmentmanager.java:2103)                                                                  @ android.support.v4.app.fragmentmanagerimpl.execpendingactions(fragmentmanager.java:2013)                                                                  @ android.support.v4.app.fragmentmanagerimpl$1.run(fragmentmanager.java:710)                                                                  @ android.os.handler.handlecallback(handler.java:739)                                                                  @ android.os.handler.dispatchmessage(handler.java:95)                                                                  @ android.os.looper.loop(looper.java:148)                                                                  @ android.app.activitythread.main(activitythread.java:5417)                                                                  @ java.lang.reflect.method.invoke(native method)                                                                  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726)                                                                  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616)

my logging in fragment, try switch replace fragment in fragmentmanager :

fragment_login : 

public class fragment_login extends fragment implements header{     private loginbutton loginbutton;     private callbackmanager callbackmanager;     private profiletracker profiletracker;     private accesstokentracker accesstokentracker;     private view view;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         view = inflater.inflate(r.layout.fragment_login, container, false);          callbackmanager= callbackmanager.factory.create();         accesstokentracker = new accesstokentracker() {             @override             protected void oncurrentaccesstokenchanged(accesstoken oldaccesstoken, accesstoken currentaccesstoken) {              }         };         profiletracker = new profiletracker() {             @override             protected void oncurrentprofilechanged(profile oldprofile, profile currentprofile) {                 loggingvalidate(currentprofile);             }         };         accesstokentracker.starttracking();         profiletracker.starttracking();         loginbutton = (loginbutton) view.findviewbyid(r.id.fb_login);         loginbutton.setfragment(this);         facebookcallback<loginresult> callback = new facebookcallback<loginresult>() {             @override             public void onsuccess(loginresult loginresult) {                 profile profile = profile.getcurrentprofile();                 loggingvalidate(profile);             }              @override             public void oncancel() {                 log.i("cancel","");              }              @override             public void onerror(facebookexception error) {                 log.i("cancel",error.tostring());              }         };         loginbutton.setreadpermissions("user_friends");         loginbutton.registercallback(callbackmanager, callback);           return view;     }      @override     public void onresume() {         super.onresume();     profile profile= profile.getcurrentprofile();         loggingvalidate(profile);      }      @override     public void onpause() {         super.onpause();     }      @override     public void onstop() {         super.onstop();         accesstokentracker.stoptracking();         profiletracker.stoptracking();     }      @override     public void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data);         callbackmanager.onactivityresult(requestcode, resultcode, data);     }     private void loggingvalidate (profile profile){         if(profile != null){             ((main) getactivity()).getsharedpreferences()                     .edit()                     .putstring(prefs_photo, profile.getprofilepictureuri(200,200).tostring())                     .putstring(prefs_prenom, profile.getfirstname())                     .putstring(prefs_nom, profile.getlastname())                     .apply();             getfragmentmanager()                     .begintransaction()                     .replace(r.id.fragment_container, new fragment_main(), "mainfragment")                     .addtobackstack("mainfragment")                     .commit();         }     }

i not understand code error. please can explain me have made badly ?

thanks


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