if you google it, some people say that you have
legacy cas model or legacy security policy model on your app.config or machine.config
the error will ocurr when you use any dynamic variable within your source code
but in my case, neither is working
so what to check?
in my case, i want my application to run on x86
but there is some dll which have combination Any Cpu/x86
simply remove Any Cpu from configuration manager solve my issue