appgrid.py crashed with PermissionError in _rmtree_safe_fd(): [Errno 13] Permesso negato: 'usr'

I tried to open a deb

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: appgrid 0.199 [origin: LP-PPA-appgrid-stable]
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CrashCounter: 1
CrashDB: {"impl": "launchpad", "project": "appgrid"}
CurrentDesktop: Unity
Date: Sat Oct 11 13:44:42 2014
ExecutablePath: /usr/share/appgrid/appgrid.py
InstallationDate: Installed on 2013-12-08 (306 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20131012)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/share/appgrid/appgrid.py /home/username/Desktop/ntm-1.3.1.deb
ProcEnviron:
 LANGUAGE=it_IT
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/share/appgrid/appgrid.py', '/home/username/Desktop/ntm-1.3.1.deb']
SourcePackage: appgrid
Title: appgrid.py crashed with PermissionError in _rmtree_safe_fd(): [Errno 13] Permesso negato: 'usr'
UpgradeStatus: Upgraded to trusty on 2014-04-27 (166 days ago)
UserGroups: adm cdrom debian-tor dip lp lpadmin plugdev sambashare sudo