This is an issue of not presenting the proper fixation and TCP frames to the HAL Tool Preset node. In your case you have a simple box, so creating XY planes at the top and bottom center of the block should suffice - refer to the image below.
Some of you have asked how to use the new Kangaroo 2 for contiguous planarization - check out the attached sample file. (File uses Kangaroo 2, Weaverbird, and Lunchbox.)