Anyhow, in case you have not solve the problem up to this point please consider:
Add the ..\NXP_Vision_Toolbox_for_S32V234\code\internals\target\create\ folder manually to the MATLAB path using right click\Add To Path\Selected Folders and Subfolders. Ideally this should be done automatically by MATLAB during toolbox installation
If this does not work, try to run the MATLAB nxpvt_create_target() directly from the folder indicated above. This way it should work for sure since the exe is in the same location as the script.
Please let us know if it worked.
... and for the future, please consider adding your questing directly into the Model-Based Design Tools for Vision community in order to ensure a faster response.