It appears that your OS is in a Serbian locale that is not recognized by SPSS. In the SPSS installation directory there is a file named loclmap.xml that defines many locales across various OS'd. There is no entry for the Serbian locale. See the SET LOCALE command in the Command Syntax Reference for details on how locales are recognized. You can add a block of entries for that locale. It might also work just to do SET LOCALE=POLISH, since that uses the same code page.