Ubuntu 20.04에서 설치시 에러가 납니다.

ubuntu 20.04에 설치후

./startup.sh 로 구동시킨다음

localhost:1975로 접속해서 

라이센스 키 넣고 설치를 하면 아래와 같은 에러가 나타납니다.
어떻게 해결해야 할까요?

java.lang.NullPointerException: Cannot read the array length because the return value of "java.io.File.listFiles(java.io.FilenameFilter)" is null
	at com.threerabbitz.model.x.(SourceFile:2144)
	at com.threerabbitz.model.x.(SourceFile:23)
	at com.threerabbitz.base.tool.sql.j.i(SourceFile:97)
	at com.threerabbitz.base.tool.sql.j.a(SourceFile:120)
	at com.threerabbitz.model.executor.A.c(SourceFile:100)
	at com.threerabbitz.model.executor.A.a(SourceFile:65)
	at com.threerabbitz.model.executor.E.a(SourceFile:17)
	at com.threerabbitz.model.p.a(SourceFile:321)
	at com.threerabbitz.model.Model.t(SourceFile:239)
	at com.threerabbitz.model.Model.b_(SourceFile:226)
	at com.threerabbitz.book.b.a(SourceFile:64)
	at com.threerabbitz.book.b.a(SourceFile:1037)
	at com.threerabbitz.book.BookApplicationLoader.k(SourceFile:188)
	at com.threerabbitz.base.b.f(SourceFile:76)
	at com.threerabbitz.base.domain.Install.a(SourceFile:1071)
	at com.threerabbitz.base.controller.InstallController.complete(SourceFile:25)
	at com.threerabbitz.base.i.a(SourceFile:43)
	at com.threerabbitz.base.FrontFilter.doFilter(SourceFile:137)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:181)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:156)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:617)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:932)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1694)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:832)

쓰리래빗츠입니다.

먼저 불편을 드려 죄송합니다. 다음 사항 확인 부탁드립니다.

감사합니다.

java 버전은 15.0.1 이고

3RABBTIZ_HOME/data/backup/transaction 디렉토리는 없고
3RABBTIZ_HOME/data/backup/lost+found 디렉토리는 존재했습니다.

우분투의 3RABBTIZ_HOME/data/backup 디렉터리의 권한 확인 부탁드립니다.

매뉴얼웍스를 시작한 사용자의 권한과 해당 디렉터리의 권한 확인 부탁드립니다.

감사합니다.

네..제가 설치마법사를 통해 설치하기 전에 
backup 디렉토리를 미리 생성한 후 다른 disk에 mount  시켜놔서 backup디렉토리의 root 권한이 들어가 있었습니다.
그래서 backup 디렉토리를 임의로 지우고, 다시 마법사를 통하여 설치하니 성공적으로 설치되었습니다.

지원해 주셔서 감사합니다.