To resolve this error is to restore meaning to the system. The administrator must create the key, define the path, and grant the permission. Only then can nut transcend its error state and fulfill its destiny. Until then, it remains a dormant process, crying out for a key that the void cannot provide.
The phrase "could not load" is a binary statement of defeat. It implies an attempt was made and subsequently thwarted. nut could not load keys.txt