I can't start the server on my Raspberry Pi 4

Hey

I can't start the server and I get everytime the same error

20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Running with the following parameters - headless: false, libraryport: -1, adminport: -1, remoteadmin: false, host: null, debug: false, execdir: /opt/ubooquity
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - #############################
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - # Starting Ubooquity #
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - #############################
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Java version: 1.8.0_212
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Java vendor: Oracle Corporation
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - java vm name: OpenJDK Client VM
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - java runtime name: OpenJDK Runtime Environment
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Max heap size available: 247 MB
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - OS name: Linux
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - OS version: 5.4.83-v7l+
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - OS architecture: arm
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Loading local version info
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Ubooquity 2.1.2 built on 2018-10-14 at 12:58
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Creating application folders
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Loading preferences
20210118 09:59:01 [main] INFO com.ubooquity.Ubooquity - Saving preferences
20210118 09:59:02 [main] INFO org.eclipse.jetty.util.log - Logging initialized @2867ms to org.eclipse.jetty.util.log.Slf4jLog
java.lang.NoClassDefFoundError: javafx/fxml/Initializable
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at com.ubooquity.e.a.d(SourceFile:597)
at com.ubooquity.e.a.loadClass(SourceFile:962)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.ubooquity.a.(SourceFile:19)
at com.ubooquity.Ubooquity.main(SourceFile:246)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.ubooquity.e.a.a(SourceFile:823)
at com.ubooquity.Launcher.main(SourceFile:10)
Caused by: java.lang.ClassNotFoundException: Failure to load: javafx.fxml.Initializable
at com.ubooquity.e.a.loadClass(SourceFile:992)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 13 more
20210118 09:59:02 [Thread-2] INFO com.ubooquity.b - Stopping internal server...
20210118 09:59:02 [Thread-2] INFO com.ubooquity.data.feeder.a - Aborting content scan...
20210118 09:59:03 [Thread-2] ERROR com.ubooquity.b - Error while stopping internal server
java.lang.NullPointerException: null
at com.ubooquity.d.e.a(SourceFile:99) ~[Ubooquity.jar:2.1.2]
at com.ubooquity.b.c(SourceFile:112) ~[Ubooquity.jar:2.1.2]
at com.ubooquity.Ubooquity.C(SourceFile:216) [Ubooquity.jar:2.1.2]
at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_212]
20210118 09:59:03 [Thread-2] INFO com.ubooquity.b - Internal server stopped
20210118 09:59:03 [Thread-2] INFO com.ubooquity.Ubooquity - Ubooquity has closed.