Programs runs in IDE,but gives error after being built.

[thekingisherenow]

Programs runs in IDE,but gives error after being built.

[Glavo]

I am receiving this error and don't know what is causing this:

Exception in Application start method
Exception in thread "JavaFX Application Thread" java.lang.NoClassDefFoundError: com/sun/javafx/scene/control/skin/ButtonSkin
        at io.github.palexdev.materialfx.controls.MFXButton.createDefaultSkin(MFXButton.java:351)
        at javafx.scene.control.Control.doProcessCSS(Control.java:897)
        at javafx.scene.control.Control$1.doProcessCSS(Control.java:89)
        at com.sun.javafx.scene.control.ControlHelper.processCSSImpl(ControlHelper.java:67)
        at com.sun.javafx.scene.NodeHelper.processCSS(NodeHelper.java:145)

Did you package it into a shadowJar?

This project supports both JavaFX 8 and JavaFX 9+ through multi-release jar. Please check whether the content of META-INF/versions/9 in the final jar is preserved, and whether the Multi-Release entry in META-INF/MANIFEST.MF is true.