Exception in thread "main" java.lang.reflect.InvocationTargetException

[schumannd]

While following the simple instructions I get the following error output:

Exception in thread "main" java.lang.reflect.InvocationTargetException
	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:497)
	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(NumberFormatException.java:65)
	at java.lang.Integer.parseInt(Integer.java:592)
	at java.lang.Integer.parseInt(Integer.java:615)
	at org.nick.abe.AndroidBackup.extractAsTar(AndroidBackup.java:280)
	... 6 more
tar: Error opening archive: Failed to open 'tmp/whatsapp.tar'
tar: Error opening archive: Failed to open 'tmp/whatsapp.tar'
tar: Error opening archive: Failed to open 'tmp/whatsapp.tar'
tar: Error opening archive: Failed to open 'tmp/whatsapp.tar'
tar: Error opening archive: Failed to open 'tmp/whatsapp.tar'

Saving whatsapp.cryptkey ...
cp: tmp/apps/com.whatsapp/f/key: No such file or directory
Saving msgstore.db ...
cp: tmp/apps/com.whatsapp/db/msgstore.db: No such file or directory
Saving wa.db ...
cp: tmp/apps/com.whatsapp/db/wa.db: No such file or directory
Saving axolotl.db ...
cp: tmp/apps/com.whatsapp/db/axolotl.db: No such file or directory
Saving chatsettings.db ...
cp: tmp/apps/com.whatsapp/db/chatsettings.db: No such file or directory

Pushing cipher key to: /storage/emulated/legacy/WhatsApp/Databases/.nomedia
adb: error: cannot stat 'tmp/apps/com.whatsapp/f/key': No such file or directory

What is the issue here? Did I skip an important step?

[schumannd]

This was caused by my phones adb version being not in sync (too old) with my computers adb version. Ended up solving the issue by using an older version of adb on my computer (see https://android.stackexchange.com/questions/83080/adb-backup-creates-0-byte-file-prompts-for-current-backup-password-even-though)

[Ishidres]

Hi. Having the same issue here. How did you manage to use an older version of adb on your computer?

Thanks in advance for any help!