I am having problem with javaswing maven application obfuscator

I am using proguardgui application to encrypt code and encounter this error. How can I get rid of this error? Can anyone assist me?

Warning: com.formdev.flatlaf.ui.FlatPopupFactory: can’t find referenced method ‘javax.swing.Popup invoke(com.formdev.flatlaf.ui.FlatPopupFactory,java.awt.Component,java.awt.Component,int,int,boolean)’ in library class java.lang.invoke.MethodHandle
Warning: com.formdev.flatlaf.ui.FlatPopupFactory: can’t find referenced method ‘javax.swing.Popup invoke(com.formdev.flatlaf.ui.FlatPopupFactory,java.awt.Component,java.awt.Component,int,int,int)’ in library class java.lang.invoke.MethodHandle
Warning: com.formdev.flatlaf.ui.FlatStylingSupport: can’t find referenced method ‘java.lang.Object invoke(java.lang.Object)’ in library class java.lang.invoke.MethodHandle
Warning: com.formdev.flatlaf.ui.FlatStylingSupport: can’t find referenced method ‘void invoke(java.lang.Object,java.lang.Object)’ in library class java.lang.invoke.MethodHandle
Warning: com.formdev.flatlaf.ui.JavaCompatibility2: can’t find referenced method ‘javax.swing.plaf.ComponentUI invoke(javax.swing.JComponent)’ in library class java.lang.invoke.MethodHandle
Warning: com.formdev.flatlaf.util.JavaCompatibility: can’t find referenced method ‘void invoke(javax.swing.JComponent,java.awt.Graphics2D,java.lang.String,int,float,float)’ in library class java.lang.invoke.MethodHandle
Warning: com.formdev.flatlaf.util.JavaCompatibility: can’t find referenced method ‘void invoke(javax.swing.JComponent,java.awt.Graphics,java.lang.String,int,int,int)’ in library class java.lang.invoke.MethodHandle
Warning: com.formdev.flatlaf.util.JavaCompatibility: can’t find referenced method ‘java.lang.String invoke(javax.swing.JComponent,java.awt.FontMetrics,java.lang.String,int)’ in library class java.lang.invoke.MethodHandle