Your root manager (Magisk, SuperSU) might have automatically denied the application's request for superuser rights.

Sometimes, a simple root checker app can help identify issues with the superuser binary. Try:

Follow these fixes in order. You do not need to be a developer—just follow carefully.

When you see the error, your phone is essentially saying, "I looked for the gateway ( su ), but I couldn't find it." Common Causes for the Error 1. Incomplete Rooting Process