If you have a separate base NSP and update NSP, install the base first, then the update — don’t try to merge them manually unless you know what you’re doing.
This is the most frequent cause. When dumping a game from a cartridge or SD card, or when converting files using tools like nsZip or NSTools, the user may accidentally select only the Update or DLC components without the Base Game. the nsp file is missing a programtype nca hot
In an NSP, each NCA has a Type (also called ProgramType): If you have a separate base NSP and
The error means: The NSP is missing a mandatory NCA (e.g., Program Type 0) required to run the game/update/DLC. This is the most frequent cause