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Could not load file or assembly System.Security.Permissions, Version=


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I have next code on C#:

string SqlConnection = $"SERVER={sql.Host};PASSWORD={sql.Password}; UID={sql.Username};DATABASE={sql.Database}";
conn = new MySqlConnection(SqlConnection);

after launching it returns an error: System.IO.FileNotFoundException: "Could not load file or assembly 'System.Security.Permissions, Version=, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.

I put the necessary dll in almost all the server folders -_-

I'm panicking!

.NET Core version 3.1

Already 4 hours can not solve the problem, please help :)

Thanks you all!


Edited by 4do4
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