The term "unspecified" is misleading. The engine knows exactly what went wrong; it simply lacks the programming to tell you. In the vast majority of cases, this error is a or a file conflict .
Modern graphics cards (NVIDIA RTX, AMD Radeon) often struggle with the old DirectX 9 rendering. The term "unspecified" is misleading
You assault a settlement. You deploy units. You click "Start Battle." Crash. The term "unspecified" is misleading