When using Tesseract 3.0, you have to install the language support files separately (http://code.google.com/p/tesseract-ocr/wiki/ReadMe)
Might cause the problem in your case.
If Tesseract 3.0 does not work, try to install the prior version 2.04 instead (which is expected by the current version of Sikuli).
I do not know, wether Tesseract 3.0 should be compatible towards Sikuli out of the box.
When using Tesseract 3.0, you have to install the language support files separately code.google. com/p/tesseract -ocr/wiki/ ReadMe)
(http://
Might cause the problem in your case.
If Tesseract 3.0 does not work, try to install the prior version 2.04 instead (which is expected by the current version of Sikuli).
I do not know, wether Tesseract 3.0 should be compatible towards Sikuli out of the box.