Update Asset Indexes gives "getFileList() is not implemented" Thank you in advance for any tips on this. 

Barely-related-background: I made a mistake on my development machine. In gparted, I chose "ignore" instead of "cancel". This is called 'choosing poorly'. Anyway, I now have freshly reinstalled my OS, apache, php, etc.

Now, as the title says, when I click "Update Asset Indexes" it gives a popup saying getFileList() is not implemented

Any suggestions what I need to do?
This exception in thrown in the class craft\volumes\MissingVolume that states one of your Volumes has an invalid class 

/**
 * @inheritdoc
 */
public function getFileList(string $directory, bool $recursive): array
{
    throw new NotSupportedException('getFileList() is not implemented.');
}


Maybe you uninstalled a plugin that adds a certain Volume class like S3 or something?