If you see an internal macsql server error, this article should help you.
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g.What could be an internal HTTP 500 system error? An internal HTTP 500 server error creates the problems your web server is facing. When this happens, your good website will provide visitors with a generic server error webpage for metrics.
An internal host failure is a failure of the main web server that you just want to access. This server is misconfigured in several ways that prevents it from properly delivering what you are requesting from the game. For example, think of a web version of an unknown screen.
Ask:
Why are there so many errors with MySQL?
The variable $ link / connection should be used every time you start an item with mysqli_ * because this is a connection. Mysqli_select_db was also wrong, you need to define the connection first and then the most important database name. Most of the 500 errors are server side errors.
I am trying to update the current OS on my macbookair7,2 to go from High Sierra to Big Sur combined with an internal 400 server error
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