--> Generally, if you have a nontrivial error with a particular thorn, first try removing that thorn from the thornlist and re-compile.
    The code will complain if other thorns on your thornlist depend on the thorn you have just removed. You can also remove some of these if they are not important.
    If it turns out a thorn you really need has a dependency on that thorn, ONLY THEN spend the time debugging.