Can't create new instances?

[y64dbg]

Unless I'm just stupid you can't create new instances? (LocalScripts, Parts, etc.)

[y64dbg]

CRITICAL ERROR:
System.Exception: Property LinkedSource must be defined in TestName!
at RobloxFiles.BinaryFormat.Chunks.PROP.Save(BinaryRobloxFileWriter writer)
at RobloxFiles.BinaryFormat.BinaryRobloxFileWriter.SaveChunk(IBinaryFileChunk handler, Int32 insertPos)
at RobloxFiles.BinaryRobloxFile.Save(Stream stream)
at RobloxFiles.RobloxFile.Save(String filePath)

[y64dbg]

LocalScript newLocalScript = new LocalScript();
newLocalScript.Parent = serverScriptService;
newLocalScript.Name = "TestName";
newLocalScript.Source = new ProtectedString("print('idfk')");

This is what I'm tryna do