Before you send the error report make sure that you have not yet informed us about the error on http://sourceforge.net/projects/sudoku-sensei. Select the Tracker->Bugs option.
If the error have not yet reported, you can select Summit New.
Also you can always send a email to the authors for help in getting any prompt.
Víctor Antolín Urtueta <mentur.SudokuSensei AT gmail.com>
Martín Knoblauch Revuelta <comocomocomo AT users.sourceforge.net>
Do not forget to include in each report the following:
Program version, operational system.
Window and current dialog refered.
Hardware characteristics: processor, ram memory and empty space on hard disk.
In case if you use Linux indicate the library version of Qt or Kde which you use.