[SUPPORT] Advanced Turn Based Tile Toolkit

hi

I am getting this warning in the output log whenever I start to modify the toolkit :

LogScript: Warning: Script Msg: Attempted to access index 0 from array ‘CallFunc_GetAllActorsOfClass_OutActors’ of length 0 in ‘/Game/AdvancedTurnBasedTileToolkit/Core/Grid/BP_GridActor.BP_GridActor_C:UserConstructionScript’!
LogScript: Warning: Accessed None trying to read property GridManagerRef

Do you understand why this is happening ?

thanks in advance
leo