Use tools like the Shaka Player Support Check to see which key systems (Widevine, PlayReady, FairPlay) your current browser actually supports.
Essentially, this means the player cannot find a configuration that matches the requirements of both the media content (the DRM system used) and the user's current environment (browser/device capabilities). 2. Common Causes shaka error 6001
These messages usually point directly to the missing/invalid element. Use tools like the Shaka Player Support Check