Oracle 10g Error of running Form

Dear All,

I have Installed Developer 10g and Database 10G in my Server then i have configure My ERP application also. when i have installed devloper and database my pc was in DHCP mode, so there is problem when i run application exception occurs that "java.lang.class not found" , i have also try with static ip but still problem not solved so any guys know this problem then plz help me


Regards,