javafx - JafaFx Load FXML file Error Null Pointer Exception -

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i have exception whith no difinition of error when trying load window button login. before worked fine, dont know why shoing error java.lang.nullpointerexception, there line in console , couldnt find whats wrong. hears files .

<splitpane dividerpositions="0.5" maxheight="-infinity" maxwidth="-infinity" minheight="-infinity" minwidth="-infinity" orientation="vertical" prefheight="400.0" prefwidth="600.0" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.mainentredcontroller">  <items>    <menubar>     <menus>       <menu mnemonicparsing="false" text="file">         <items>           <menuitem mnemonicparsing="false" text="close" />         </items>       </menu>       <menu mnemonicparsing="false" text="edit">         <items>           <menuitem mnemonicparsing="false" text="delete" />         </items>       </menu>       <menu mnemonicparsing="false" text="help">         <items>           <menuitem mnemonicparsing="false" text="about" />         </items>       </menu>     </menus>   </menubar>   <tabpane prefheight="200.0" prefwidth="200.0"  tabclosingpolicy="unavailable">     <tabs>       <tab text="home" />     </tabs>   </tabpane>  </items> </splitpane>

and function lunchs view in class named maincontroller

public void loginbtnclick(actionevent event) throws exception{     string usern = username.gettext();     string pass = txtpassword.gettext();      try {          if( con.logindatabase(usern, pass)){                 lblstatus.settext("login successfully");                 stage primarystage1 = new stage();              parent root = fxmlloader.load(getclass().getresource("/application/viewsfx/mainentredhome.fxml"));                  scene scene = new scene(root);                 scene.getstylesheets().add(getclass().getresource("application.css").toexternalform());                 primarystage1.setscene(scene);                 primarystage1.show();                  // closing login scene                  stage stage = (stage) btnlogin.getscene().getwindow();                     stage.close();                  }else {                     lblstatus.settext("login failed");                 }     } catch (exception e) {         system.out.println(e);         system.out.println("ani hna mebloki");      }

and controller of splitpane view class named mainentrecontroller, when click on logni shows me eception java.lang.nullpointerexception


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