unable to destroy an object,getting error "java.lang.UnsupportedClassVersionError:Bad version number in .class file

Hi,

  i'm getting error "java.lang.UnsupportedClassVersionError:Bad version number in .class file", when try to destroy an object through IAPI. Actually i ve created a TBO for dm_user and after that i'm unable to login in DA/Webtop. I'm getting some error on my app. server. To resolve this problem, i want to delete installed jar file and module for that TBO, so i'm trying to delete this jar file through IAPI commnad but getting above mentioned error.

How can i fix this issue?