95: Malformed custom-mark declaration

In metadata declarations a name beginning with an ampersand & refers to a custom mark. The custom mark is expected to consist of a single small or capital letter, a–z or A–Z, or a single digit 0–9 right after the ampersand. In your case, either the character after the ampersand is missing or the ampersand is followed by more than one or other characters than expected.

Solution

Make sure the name of a custom mark only consists of an ampersand and a single latin letter or a digit like in the following example:

@ &b: ->data:text/html;base64,PHdicj4=