This almost always means a or Java mismatch .
If you are trying to run —a performance-oriented modpack designed for low-spec PCs—on Windows 7 , you may encounter crashes, driver errors, or the dreaded "Has Stopped Working" message. While Windows 7 is an older operating system, these common fixes can help get your game running smoothly. Common Windows 7 Issues for OptiCraft opticraft minecraft windows 7 fix
The "Opticraft" error is not a bug—it is a symptom of time. Windows 7 was a masterpiece of operating system engineering, but it was built for an era of DirectX 9 and single-core CPUs. Minecraft’s evolution into a massive, multi-threaded OpenGL beast has left it behind. This almost always means a or Java mismatch