Ensure you are launching the NSP and not just an update.
The error typically occurs when you attempt to launch an Update or DLC file as if it were the base game, or when the base game data within the NSP is corrupt or incomplete . 1. Identify the Correct File
The programType field is crucial as it indicates the type of program (e.g., game, DLC, update) the NCA file represents. Without this information, the NSP file cannot be properly processed or installed on a Nintendo Switch.
Extract a Program NCA from a matching XCI or another NSP