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You need download this https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2188081793 mod to fix it
It only work from start of the game. But also add extra slot to barracks at any time in the game.
Read this guide to know more
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2218956201&searchtext=Mod+Limit+CTD+%3A+Five+Types+of+Overflow
Limit is 122 class. You can only add 104 modded class and always have 18 vanila class.