error during extraction

[Mario Carmine]

Hi! Thank you very much for your work.
I'm trying to execute
java -jar abe.jar unpack C:\whatsapp.ab C:\whatsapp.tar

but I get

Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: java.lang.RuntimeException: java.lang.NumberFormatException: For input string: ""
at org.nick.abe.AndroidBackup.extractAsTar(AndroidBackup.java:420)
at org.nick.abe.Main.main(Main.java:128)
... 5 more
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at org.nick.abe.AndroidBackup.extractAsTar(AndroidBackup.java:280)
... 6 more

I've tried in Ubuntu 16.04 and Windows 10. Always the same error.

[dragomerlin]

1) What is the size of whatsapp.ab?
2) What android version runs your smartphone?
3) What is the output of this command?: java -jar abe.jar -debug info C:\whatsapp.ab
4) Could you replicate the issue with any other app, or only happens with Whatsapp?
5) Does it happen the same with abe-master.jar in this folder? https://sourceforge.net/projects/adbextractor/files/test/