Exception: Attempting to make a move on ChessSquare D7 with empty piece.
TheChess.Mechanism.ChessGameBase.IsPromotion (TheChess.Mechanism.ChessMove uncheckedMove) (at D:/Projects/_Freelancing/chess/Assets/TheChess/Scripts/Mechanism/Core/ChessGameBase.cs:71)
TheChess.ChessBaseGUI.OpponentMovePiece (TheChess.Mechanism.ChessMove move, TheChess.Mechanism.ChessPiece+ChessPieceType promotionType, System.Boolean isMoveContinueGame) (at Assets/TheChess/Scripts/Main/GUIs/ChessBaseGUI.cs:310)
TheChess.ChessBaseGUI.InstantMove (TheChess.Mechanism.ChessMove move, TheChess.Mechanism.ChessPiece+ChessPieceType promotionType, System.Boolean isMoveContinueGame) (at Assets/TheChess/Scripts/Main/GUIs/ChessBaseGUI.cs:527)
AIGUI.AIMakeMove (TheChess.Mechanism.ChessMove _move, TheChess.Mechanism.ChessPiece+ChessPieceType _promotionType) (at Assets/_Project/Scripts/ChessExtensions/AIGUI.cs:37)
TheChess.ChessGameAIGUI+<>c__DisplayClass22_0.<ThreadedSearch>b__0 () (at Assets/TheChess/Scripts/Main/GUIs/ChessGameAIGUI.cs:203)
TheChess.UnityThread.LateUpdate () (at Assets/TheChess/Scripts/Main/Others/UnityThread.cs:173)