RPG Maker Forums

First post up here as I seem to have hit a wall.

Am attempting to run the YEP plugin listed in the title. I set a sample creature to yield high XP to test and went into Playtest Mode. At end of combat, I received the message (error has been duplicated several times):

Game has encountered a bug. Please report it.

SyntaxError: Invalid regular expression: /
at Game_Actor.performLevelUpGrowthFromObject (YEP_LevelUpGrowthEffects.js:223:21)
at Game_Actor.performLevelUpGrowth (YEP_LevelUpGrowthEffects.js:182:10)
at Game_Actor:levelUp (YEP_LevelUpGrowthEffects.js:152:8)
at Game_Actor:changeExp (rpg_objects.js:3882:14)
at Game_Actor:gainExp (rpg_objects.js:3928:10)
at Game_Actor.gainExp (YEP_X_Subclass.js:893:40)
at chrome-extension://odlameecjipmbmbejkplpemijjgpljce/js/rpg_managers.js:2772:15
at Array.forEach ()
at Function.BattleManager.gainExp (rpg_managers.js:2771:29)
at Function.BattleManager.gainRewards (rpg_managers.js:2764:10)

NOTE 1: I noted the problem with the subclass script. Tried disabling it and all other problems persist. Problem goes away when Level Up Growth Effects is disabled (even if subclasses are up and running), however.
NOTE 2: I have been following the recommended download order from the wiki verbatim, disabling only the following scripts that did not seem relevant to my work at this time:

Core Updates Optimization
ATB Battle System
Visual ATB Gauge
CTB Battle System
STB Battle System
Battle Select Cursor
Tick Based Regen
Visual State FX
Armor Scaling
Area of Effect
Selection Control

I also have the line-break commands to break up areas (taken from Yanfly, all turned off), have uploaded the Base Troop Events early, and the base events that came with MV (monster book, item book, etc.) are still at the bottom of my list (all off). Other than base troop events, I am barely reaching the end of my battle plugins (in case downloading the rest should somehow fix things?)

Finally, I note that the help notes on the plugin in question do not mention the 1.01 bugfix noted on the site (even though I purchased the plugins this weekend).

Apologies if this is too much info. Wanted to check if this a known problem and if there are any ideas for troubleshooting.