TypeError: Cannot read property '0' of undefined
at Window_Techtree.initialize (FELSKI_TECHTREE.js:899)
at new Window_Techtree (FELSKI_TECHTREE.js:885)
at Scene_Techtree.createTechtreeWindow (FELSKI_TECHTREE.js:832)
at Scene_Techtree.start (FELSKI_TECHTREE.js:823)
at Function.SceneManager.updateScene (rpg_managers.js:2019)
at Function.SceneManager.updateMain [as updateMainFluidTimestep] (rpg_managers.js:1983)
at Function.SceneManager.updateMain (YEP_FpsSynchOption.js:201)
at Function.SceneManager.update (rpg_managers.js:1907)
at Function.SceneManager.update (KELYEP_DragonBones.js:754)
SceneManager.catchException @ Olivia_AntiPlayerStress.js:331
Could you help me with this pls