I was using Gluon Scene Builder 8.3.0 and i uninstalled it then after i installed new version of 8.4.0 but it gave me some errors when i want to run the program. Errors and java version properties below;
Also i tried to open JavaFX SceneBuilder 2.0 and its running well. Screenshot below;
At 1st thanks to Jose Pereda for help me to solve this problem. You have to change your locale language to English as this link below if your locale is Turkish language. But don't worry, the gluon team will fix this issue soon.