Card template has a problem

Anki has recently become stricter about reporting mistakes in card templates. In the past, it would silently ignore some problems, but display templates in unexpected ways. This change has been made to make mistakes easier to notice.

If you have not edited your card templates yourself, it is likely you have downloaded a shared deck, where the original deck author made a mistake when creating the template.

You can correct mistakes on the template by opening the card templates screen:

• On the computer version, edit a problem card, and then click on the Cards... button
• On AnkiMobile, while viewing a problem card in the review screen, tap the cog/gear, then Card Template.

When you correct a mistake, it will update all cards of that type - you do not need to make the same change for every card that uses the template.

What needs changing will depend on the message you are getting.

Found '{{Field}}', but there is no field called 'Field'

This indicates your template includes the name of a field that doesn't exist. To fix the problem, locate the
{{Field}} inside the card template, and remove it.

Missing }} in {{Field

This message is shown when {{ is found in the template without a matching }}. For example, if you have

{{Field

then this needs to be changed to

{{Field}}

Missing {{/Field}}

This means Anki found {{#Field}} or {{^Field}} in your card template, without a matching {{/Field}}. Removing {{#Field}} or {{^Field}} from the template will fix the error.

Found {{/One}}, but expected {{/Two}}

Conditional replacements need to be closed in the same order they are opened. For example, the following template is incorrect:

{{#One}}
  {{#Two}}
    {{Three}}
  {{/One}}
{{/Two}}

To fix the problem, the template should be changed like so:

{{#One}}
  {{#Two}}
    {{Three}}
  {{/Two}}
{{/One}}

Found {{/Field}}, but missing '{{#Field}}' or '{{^Field}}'

Closing tags must be matched by opening tags. For example, the following is invalid, because there is no {{#Two}} or {{^Two}} at the start:

  {{Field}}
{{/Two}}

It can be fixed by removing the closing tag:

{{Field}}