template/unknown-field

A Template reads a field or a variable that isn’t in the schema of what its Page sees: a typo, a field of another Collection, a value only another kind of Route has, such as entries on a Taxonomy’s index, or a field of something that has none, such as a string. check finds it even on a path no Entry reaches, or one | default would hide.

Example

<h1>{{ entry.titel }}</h1>

Fix

Use the name the help suggests, here entry.title, or declare the field in the Collection’s [collections.<name>.fields].