Help on island tutorial!! please

Can anybody help me with this problem??

I added the island demo into my project view but It showed me an error with the script "PerformanceTweak". The error says:

"Assets/IslandDemo/Assets/Scripts/Performance/PerformanceTweak.js(1,13): BCE0018: The name 'IslandWater' does not denote a valid type ('not found'). Did you mean 'System.Runtime.Remoting.Channels.IClientChannelSink'? " I Have tried searching this error but apparently nobody said anything. So I can't find the answer to the problem. I do know It has something to do with the "IslandWater" script but I can't find out what!!

Please help!!

does the island demo run without it? if so, then just delete the script. If not, see if there is a script named island water.