205: Missing whitespace between key and answer

You started a line with curly brackets { } which marks an option. An option consists of

• a key enclosed in curly brackets
• optionally exactly one of the following characters
  • an apostrophe ' for an exclusive option
  • an exclamation mark ! for a required option
  • a hyphen - for a preselected option
  • a digit 0 or 1 for a binary challenge
• and usually text separated by whitespace from what came before it.

In your case, a whitespace character is missing before the option’s text.

Solution

Make sure to leave whitespace before the text of an option. A single space is enough:

{x} 42