Hello xmwang,
Thank you for reporting this issue.
Please try replacing the following files with the ones attached, but before that please make a backup for the existing ones.
{Toolbox install dir}\NXP_MBDToolbox_S32K1xx\code\mbdtbx_s32k14\mbdtbx_s32k14\ folder mbd_s32k14_ec_toolbox.mdl file
{Toolbox install dir}\NXP_MBDToolbox_S32K1xx\code\mbdtbx_s32k14\mbdtbx_s32k14\mscripts\pdb\ folder mbd_s32k14_trgmux_get_trgsrc_enum.p file
Please give us a feedback after you replaced the files.
Best regards,
Marius