perspective.py crashed with UnboundLocalError in effect()

[Marco Aurelio]

Binary package hint: inkscape

Traceback (most recent call last):
  File "/usr/share/inkscape/extensions/perspective.py", line 127, in <module>
    e.affect()
  File "/usr/share/inkscape/extensions/inkex.py", line 154, in affect
    self.effect()
  File "/usr/share/inkscape/extensions/perspective.py", line 80, in effect
    solmatrix[i][0] = sp[i][0]
UnboundLocalError: local variable 'sp' referenced before assignment

ProblemType: Crash
Architecture: i386
Date: Wed Apr 30 09:36:40 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/share/inkscape/extensions/perspective.py
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: nvidia
Package: inkscape 0.46-0ubuntu2
PackageArchitecture: i386
ProcCmdline: python /usr/share/inkscape/extensions/perspective.py --id=rect9409 --id=rect9407 /tmp/ink_ext_XXXXXX.svgT5QFAU
ProcEnviron:
 PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/share/inkscape/extensions/perspective.py', '--id=rect9409', '--id=rect9407', '/tmp/ink_ext_XXXXXX.svgT5QFAU']
SourcePackage: inkscape
Title: perspective.py crashed with UnboundLocalError in effect()
Uname: Linux 2.6.24-16-generic i686
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin netdev plugdev powerdev scanner video