'Need preview provider named "ContentView_Previews_" in Xcode to use live preview

I am new to programming and I am trying to build my 1st app using Swift in Xcode for iOS. But when I try to use the live preview feature, it says that it needs the preview provider "ContentView_Preview_" in order to use the live preview. Could you please tell me how to get this preview provider? Thanks in advance!

iosswiftxcode


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