Unable to start Tor: Unable to start Tor

I used Orbot for a couple of weeks without any problems, now it has suddenly stopped to start without any apparent reason.

My phone is a Galaxy S4 i9505 with Android 4.3 with root rights.

Thank you for your help.

[ 12-28 16:10:34.812 18135:20310 D/Orbot    ]
Orbot è in esecuzione...

[ 12-28 16:10:35.052 18135:20310 D/Orbot    ]
(re)Setting permission on Tor binary

[ 12-28 16:10:35.072 18135:20310 D/Orbot    ]
executing shell cmd: chmod 700 /data/data/org.torproject.android/app_bin/tor; runAsRoot=false;waitFor=true

[ 12-28 16:10:35.082 18135:20310 D/Orbot    ]
(re)Setting permission on Privoxy binary

[ 12-28 16:10:35.102 18135:20310 D/Orbot    ]
executing shell cmd: chmod 700 /data/data/org.torproject.android/app_bin/privoxy; runAsRoot=false;waitFor=true

[ 12-28 16:10:35.122 18135:20310 D/Orbot    ]
(re)Setting permission on Obfsproxy binary

[ 12-28 16:10:35.142 18135:20310 D/Orbot    ]
executing shell cmd: chmod 700 /data/data/org.torproject.android/app_bin/obfsproxy; runAsRoot=false;waitFor=true

[ 12-28 16:10:35.192 18135:20310 D/Orbot    ]
executing shell cmd: export HOME=/data/data/org.torproject.android/app_bin; runAsRoot=false;waitFor=false

[ 12-28 16:10:35.192 18135:20310 D/Orbot    ]
executing shell cmd: /data/data/org.torproject.android/app_bin/tor DataDirectory /data/data/org.torproject.android/app_data -f /data/data/org.torproject.android/app_bin/torrc || exit
; runAsRoot=false;waitFor=false

[ 12-28 16:10:39.497 18135:20310 D/Orbot    ]
executing shell cmd: export HOME=/data/data/org.torproject.android/app_bin; runAsRoot=false;waitFor=false

[ 12-28 16:10:39.497 18135:20310 D/Orbot    ]
executing shell cmd: /data/data/org.torproject.android/app_bin/tor DataDirectory /data/data/org.torproject.android/app_data -f /data/data/org.torproject.android/app_bin/torrc || exit
; runAsRoot=false;waitFor=false

[ 12-28 16:10:44.051 18135:20310 D/Orbot    ]
executing shell cmd: export HOME=/data/data/org.torproject.android/app_bin; runAsRoot=false;waitFor=false

[ 12-28 16:10:44.051 18135:20310 D/Orbot    ]
executing shell cmd: /data/data/org.torproject.android/app_bin/tor DataDirectory /data/data/org.torproject.android/app_data -f /data/data/org.torproject.android/app_bin/torrc || exit
; runAsRoot=false;waitFor=false

[ 12-28 16:10:48.545 18135:20310 E/Orbot    ]
Unable to start Tor: Unable to start Tor
java.lang.Exception: Unable to start Tor
	at org.torproject.android.service.TorService.runTorShellCmd(TorService.java:828)
	at org.torproject.android.service.TorService.initTor(TorService.java:676)
	at org.torproject.android.service.TorService.run(TorService.java:312)
	at java.lang.Thread.run(Thread.java:841)

Trac:
Username: jack80