dump_data ends in an exception

Hello, I found this bug when i tried to edit the pdf bookmarks. The export and import of pdf data does not seem to work.

pdftk test.pdf dump_data output data.txt 
Unhandled Java Exception in create_output():
java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringEscapeUtils
	at report.OutputXmlString(Unknown Source)
	at report.OutputPdfName(Unknown Source)
	at report.ReportInfo(Unknown Source)
	at report.ReportOnPdf(Unknown Source)
	at TK_Session.create_output(Unknown Source)
	at pdftk.main(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang3.StringEscapeUtils
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
	... 6 more

• the tested pdf test.pdf
• output data.txt