java - Illegal state exception :Field added to a manager while it is already parented -


i'm getting exception illegalstateexception :

field added manager while parented

when call below function second time,when changing value of spinner , function called second time, getting illegal state exception.

here code :

void showspinnerdialog(int type) {     if (_customspinnerpopup == null) {         _customspinnerpopup = new customspinnerpopup();     }      uiapplication.getuiapplication().pushmodalscreen(_customspinnerpopup);      if (_customspinnerpopup.isset()) {         string choice = _customspinnerpopup.getchoice();         _editfieldspinbox.settext(choice);         getalbumsforlanguage(choice);     } }  private void getalbumsforlanguage(string choice) {     language = choice;     fieldmanager.deleteall();      final richlist list = new richlist(fieldmanager, true, 2, 1);     songitemslist = new vector();     songitemslist = serverapi.getnewsongsforlanguage(language, null);     (int = 0; < songitemslist.size(); i++) {         songitem songitem = (songitem) songitemslist.elementat(i);         list.add(new object[] { bitmap1, songitem.getname(),             "artist:" + songitem.getartist(),         "movie: " + songitem.getmovie() });     }      add(fieldmanager);// **here getting exception**     list.setfocuspolicy(tablecontroller.row_focus);      list.setcommand(new command(new commandhandler() {          public void execute(readonlycommandmetadata metadata, object object) {             songitem song = (songitem) songitemslist.elementat(list.getfocusrow());             dialog.alert("exe !" + song.getname());

as exception message suggests, cannot add field or manager (which field) container, more once, unless remove first. when call getalbumsforlanguage() second time, call this:

add(fieldmanager);// **here getting exception**

a second time, illegal. solve this, surround line with:

if (fieldmanager.getmanager() == null) {    add(fieldmanager); }

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