The Blastcore family of visual effect mods is the most common source of this error, specifically the or "Murr Edition" variants. The mod author often has to release a "shader patch" alongside each Arma 3 update.
The "Shaders not valid (mismatch of exe and data?)" error in arma 3 shaders not valid patched
The "Shaders not valid" error in typically stems from a version mismatch between the game's executable ( arma3.exe ) and its data files, often occurring after an update or when third-party mods interfere with core configurations. Primary Fix: Modify or Reset arma3.cfg The Blastcore family of visual effect mods is
If the base game is fine but the error persists when using mods: arma 3 shaders not valid patched
through Steam: