tesseract assert failure: tesseract: unicharset.cpp:76: const UNICHAR_ID UNICHARSET::unichar_to_id(const char*, int) const: Assertion `ids.contains(unichar_repr, length)' failed.

Tesseract fails

ignasi@ignasi-desktop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu lucid (development branch)
Release: 10.04
Codename: lucid
ignasi@ignasi-desktop:~$

ProblemType: Crash
DistroRelease: Ubuntu 10.04
Package: tesseract-ocr 2.04-2
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
AssertionMessage: tesseract: unicharset.cpp:76: const UNICHAR_ID UNICHARSET::unichar_to_id(const char*, int) const: Assertion `ids.contains(unichar_repr, length)' failed.
CheckboxSubmission: be855d426122c5a11956fef117ded5b1
CheckboxSystem: edda5d4f616ca792bf437989cb597002
CrashCounter: 1
Date: Sun Apr 18 02:36:10 2010
ExecutablePath: /usr/bin/tesseract
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
ProcCmdline: tesseract /tmp/UZBC9Lf9jw/jvkFElmSob.tif /tmp/UZBC9Lf9jw/BE5MYeneZ6 -l spa
ProcEnviron:
 LANG=ca_ES.utf8
 SHELL=/bin/bash
Signal: 6
SourcePackage: tesseract
StacktraceTop:
 raise () from /lib/libc.so.6
 abort () from /lib/libc.so.6
 __assert_fail () from /lib/libc.so.6
 ?? ()
 ?? ()
Title: tesseract assert failure: tesseract: unicharset.cpp:76: const UNICHAR_ID UNICHARSET::unichar_to_id(const char*, int) const: Assertion `ids.contains(unichar_repr, length)' failed.
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare