CraftBay doesn't see Vault, and other vault plugins

[Fattoush]

[17:04:11] [Server thread/WARN]: Enabled plugin with unregistered PluginClassLoader CraftBay v2.26
[17:04:11] [Server thread/ERROR]: [CraftBay] Failed to setup economy. CraftBay is not enabled!
[17:04:11] [Server thread/ERROR]: Error occurred while enabling CraftBay v2.26 (Is it up to date?)