method body replaced by unityLinker.exe with a notsupportedexception

I'm working with mysql.data and newtonsoft json dll for my game. There is a problem. I'm building my game with mono scriptbaackend method. My game works perfectly. But when i use il2cpp My game mysqlconnection not working. it says method body replaced by unityLinker.exe with a notsupportedexception Editor works fine. But when i try on my mobile device i'm getting this error when i try to connect my database.