Release issue :: Unable to release components

While performing release, exception is being thrown by the Continuum build agent saying "java.lang.UnsupportedClassVersionError: Bad version number in .class file (unable to load class org.eclipse.jetty.util.security.Password)"

I am new to Contiuum and setting it up for the first time. Any help in this would be greatly appreciated. Thanks in advance.

Attached the log file.