The type or namespace name 'Database' does not exist, help please.

Hi guys, I'm trying to start TheBrodieMan's Ashes of Al'ar Mount Grind

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But it comes up with this in red writing when I try to load it.

[Compiler Error]: C:\Users\******\Documents\Honorbuddy\Quest Behaviors\QuestBehaviorCore\Utility\Query_Database.cs(23,22) : error CS0234: The type or namespace name 'Database' does not exist in the namespace 'Styx.CommonBot' (are you missing an assembly reference?)

Please help. Thanks

[Edited to add the log]