Can you try reinstalling dsBudget and re-installing it again? It looks like you are missing some libraries installed by the installer.
If you look under your dsBudget install directory, you should find "tomcat" directory, and inside it you should find following directory.
/tomcat/webapps/dsbudget/WEB-INF/lib/
-rw-r--r-- 1 root root 263965 Aug 12 02:01 commons-codec-1.9.jar
-rw-r--r-- 1 root root 261809 Aug 12 02:01 commons-lang-2.4.jar
-rw-r--r-- 1 root root 138956 Aug 12 02:01 commons-validator-1.3.1.jar
-rw-r--r-- 1 root root 222577 Aug 12 02:01 divrep.jar
-rw-r--r-- 1 root root 309293 Aug 12 02:01 jcommon-1.0.16.jar
-rw-r--r-- 1 root root 1425744 Aug 12 02:01 jfreechart-1.0.13.jar
-rw-r--r-- 1 root root 391834 Aug 12 02:01 log4j-1.2.15.jar
If you don't see these files, I am guessing un/re-installing will fix put them back there.. I hope!
Soichi