Rider does not prompt after opening unity script

stay Unity in ：Edit->preference->External Tools Choose Rider
then Assets->Open C# Project open C# project
Get into Rider Look at the console output , The initial installation will generally prompt the lack of sdk（.NET SDK）
According to Rider Prompt to download the corresponding thing
You can also go. Download from the official website , Looking at Rider, The normal （Ctrl+ Left click to jump ）.