Error when trying to make a new game

Game Dev Tycoon bug
#1

Error Alert
TypeError: Cannot read property ‘isCustom’ of null

Enabled Mods:

Game Dev Tycoon Mod API by support@greenheartgames.com
UltimateLib by Francesco Abbattista and Chad Keating
Expansion Pack Mod by DzjengisKhan (Founder & Leader) & LineLiar (Co-Leader)
Game Version: 1.5.28

Platform: Windows

Distribution: Steam

Can anyone please help me with this?!?!?!

#2

UltimateLib is outdated and causes this sort of errors. Just disable the mods, nothing else you can do.

#3

There should be a successor to UltimateLib but with much more the same functionality as the same one.