Error Messages

Message:
Exception in thread "main" java.lang.UnsupportedClassVersionError:

Cause: you are using a version of Java that is too old. You need Java 7, which can be downloaded from http://www.oracle.com/technetwork/java/javase/downloads/.
Message:
Process timed-out (process time limit: 300000ms)

Cause: a spawned process has been aborted because it has taken too long to complete. The default time-out value is 300000ms (5 minutes). This most-likely means that the process has got stuck, but if you have a very slow machine and a very large book, you may need to increase the time-out threshold using the -timeout command line switch.
LaTeX Message:
! LaTeX Error: Command \c@lenddoca already defined. Or name \end... illegal, see p.192 of the manual.

Cause: conflict between combine.cls and hyperref.sty. You need to upgrade to at least version 1.16 of jmlr.cls and jmlrbook.cls.