Blueprint Runtime Error: "Accessed None trying to read property CallFunc_GetInventoryRef_MainInventoryRef"

hello im trying to make an mmorpg game and i got a free starter with everything i need and i changed the map and it gives me those errors

Blueprint Runtime Error: “Accessed None trying to read property CallFunc_GetInventoryRef_MainInventoryRef”. Node: Initialize Graph: OnRep_MyControlledPawn Function: On Rep My Controlled Pawn Blueprint: BP_ARPG_PlayerController

Blueprint Runtime Error: “Accessed None”. Node: Initialize Graph: OnRep_MyControlledPawn Function: On Rep My Controlled Pawn Blueprint: BP_ARPG_PlayerController

and when i enter in it i don’t see anything wrong