When I run this in Gimp 2.8 on Fedora 21 I get this:

Traceback (most recent call last):
  File "/usr/lib64/gimp/2.0/python/gimpfu.py", line 735, in response
    dialog.res = run_script(params)
  File "/usr/lib64/gimp/2.0/python/gimpfu.py", line 361, in run_script
    return apply(function, params)
  File "/home/jhaiduce/.gimp-2.8/plug-ins/InsaneBump.py", line 222, in batchnr
    doBaseMap(image, diffuse, Depth, LargeDetails)
  File "/home/jhaiduce/.gimp-2.8/plug-ins/InsaneBump.py", line 150, in doBaseMap
    pdb.plug_in_normalmap(image, newlayer, 5, 0.0, Depth * ok, 0, 0, 0, 0, 0, 0, 1, 0, 0.0, newlayer)
error: procedure not found

Apparently InsaneBump depends on plug-in-normalmap, which isn't installed.