ロブさんのチュートリアル「エンドレスランナー」（日本語）
をエンジンのver4.7で作成しプレイできるのを確認し、その後ver4.10で開き直しプレイしてみたところ
床が最初の一つ以外自動生成されずにキャラクターが奈落の底へと落下していきました。
エラーログによる
エラー Cannot access ‘BP_Floortile_LeftCorner_C_2’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
エラー Cannot access ‘BP_FloorTile_C_3’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
エラー Cannot access ‘BP_FloorTile_Rampdown_C_2’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
エラー Cannot access ‘BP_Floortile_LeftCorner_C_3’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
エラー Cannot access ‘BP_Floortile_LeftCorner_C_4’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
エラー Cannot access ‘BP_Floortile_LeftCorner_C_5’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
エラー Cannot access ‘BP_FloorTile_C_4’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
エラー Cannot access ‘BP_Floortile_RightCorner_C_1’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorCurve’ in blueprint RunGameMode
エラー Cannot access ‘BP_FloorTile_Rampup_C_3’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
情報 /Game/ThirdPersonBP/Maps/UEDPIE_0_Run 0.676のプレイ イン エディタの開始時間
エラー Cannot access ‘BP_FloorTile_C_5’. It is pending kill. Property: ‘K2Node_DynamicCast_AsBP_Floor_Tile’ from node Get Attach Point in graph ‘AddFloorTile’ in blueprint RunGameMode
この場合、どこを修正したらver4.10でもプレイできるのでしょうか？
よろしくおねがいします。
