Unknown Role:
.
cells:
  - cell_type: markdown
    metadata: {}
    source: |
        a
  - cell_type: markdown
    metadata: {}
    source: |
        {unknown}`a`
.
<string>:20002: (WARNING/2) Unknown interpreted text role "unknown". [myst.role_unknown]
.

Unknown directive:
.
cells:
  - cell_type: markdown
    metadata: {}
    source: |
        a
        ```{xyz}
        ```
.
<string>:10003: (WARNING/2) Unknown directive type: 'xyz' [myst.directive_unknown]
.

Directive parsing error:
.
cells:
  - cell_type: markdown
    metadata: {}
    source: |
        ```{class}
        ```
.
<string>:10002: (ERROR/3) Directive 'class': 1 argument(s) required, 0 supplied
.

Directive run error:
.
cells:
  - cell_type: markdown
    metadata: {}
    source: |
        ```{date}
        x
        ```
.
<string>:10002: (ERROR/3) Invalid context: the "date" directive can only be used within a substitution definition.
.

Duplicate reference definition:
.
cells:
  - cell_type: markdown
    metadata: {}
    source: |
        [a]: b
  - cell_type: markdown
    metadata: {}
    source: |
        d

        [a]: c
.
<string>:20004: (WARNING/2) Duplicate reference definition: A [myst.duplicate_def]
.
