I included a picture of the FlexBus (Init_FB) Processor Expert (PE) component:

To recreate the problem:
1) Create a new MK64FN1M0VLQ12 (LQFP 144-pin package) project with PE within CodeWarrior 10.6.
2) Add component Init_FB to its PE.
3) Populate the Init_FB's values in the same way shown in the picture above.
No start address that you enter is allowed.