I tried to select the HCS12E family from CodeWarrior, but there is no E family to select.
Which version of CW do you used ? And what about your PC system ?
You can use the CWv5.1, it support the HCS12E chips:
it support these systems:
You can download it at here :
CodeWarrior® Dev Tools for HCS12(X) MCUs|NXP
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