Share a screenshot of what you see on the following lines:
- NPCScriptManager line 178
- NPCMoreTalkHandler line 72
The way you can fix this is reading this error and working backwards. You see that "MapleInventoryType" is not defined, therefore it's either not coded OR the reference is incorrect (maybe the naming is different in heaven vs. the source that the add on is using). Look at each error in your screenshot above, then go to that file and line, and see if you can locate what the issue is yourself.
Ask questions, you got this