Looking at your code, you probably haven't indented below line properly:

    System.TypeInitializationException occurred

You need to indent your code by four spaces, or select it all and press the `{}` button. Also make sure there is one blank line between your last line of text and your first line of code. This will cause your code to be rendered in `<pre><code>` blocks and all of its HTML/Markdown entities will be escape/ignored respectively.


Properly indented code renders like this:

    #include <iostrea>

    int main() {
      vector<int> items;
    }

Unindented code renders like this:

> # include <isotream>
> 
> int main() {   vector<int> items; }


You can see why we stress proper indenting of code.