B4J Question B4JBuilder 6.51 + Java 11 does not work

System.Exception: Error: src\b4j\example\main.java:7: error: package javafx.application does not exist
public class main extends javafx.application.Application{
^
Note: src\b4j\example\main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

javac 11.0.2

at eh.a(a A_0)
at a2.j(String[] A_0)
at a2.m(String[] A_0)
Error: src\b4j\example\main.java:7: error: package javafx.application does not exist
public class main extends javafx.application.Application{
^
Note: src\b4j\example\main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

javac 11.0.2

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