Oracle (oci 8) not found error - whiel connecting thro' DAC Client

I am getting following when I try to login DAC client
Oracle (oci 8) not found error
- Check whether the jar files listed in config.bat under DAC folder
available in folder\lib
- If not available, copy it from oracle cilent install folder.
- also check if oracle bin folders is in environmental variables. if not add it in PATH environmental variable and reboot the server and check