❔ Cannot find explanation of error

Hello. I came across this error, but when I clicked on its reference (cs1069), it took me here:
https://learn.microsoft.com/en-us/dotnet/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error?f1url=%3FappId%3Droslyn%26k%3Dk(CS1069)
What is it and how can I solve it?
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List of possible resources for compiler errors and warnings that haven't been documented yet.
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