Cannot declare a variable of static type 'DepotChunk'

Argument 5: cannot convert from 'SteamKit2.CDN.Server' to 'byte[]?'

'DepotChunk' does not contain a definition for 'ChunkInfo' and no accessible extension method 'ChunkInfo' accepting a first argument of type 'DepotChunk' could be found (are you missing a using directive or an assembly reference?)

'DepotChunk' does not contain a definition for 'Data' and no accessible extension method 'Data' accepting a first argument of type 'DepotChunk' could be found (are you missing a using directive or an assembly reference?)

'DepotChunk' does not contain a definition for 'Data' and no accessible extension method 'Data' accepting a first argument of type 'DepotChunk' could be found (are you missing a using directive or an assembly reference?)

'DepotChunk' does not contain a definition for 'Data' and no accessible extension method 'Data' accepting a first argument of type 'DepotChunk' could be found (are you missing a using directive or an assembly reference?)