Thank you for your valuable hint.
Now I able to see the error:
/usr/bin/pdftotext: /opt/lampp/lib/libjpeg.so.62: no version information available (required by /usr/lib/libpoppler.so.13)
/usr/bin/pdftotext: /opt/lampp/lib/libgcc_s.so.1: version `GCC_4.2.0' not found (required by /usr/lib/i386-linux-gnu/libstdc++.so.6)
I think it's something related to XAMPP for linux, If you know how to solve it, I will be appreciated.
Finally, I found the solution, I just searched for the two files (libjpeg.so.62 and libgcc_s.so.1) in /usr and then I copied each file to /opt/lampp/lib, of course replace is occurred.