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angular-cn/aio/content/errors/NG8002.md
twerske 3cfb4b4ef9 docs: add embedded videos to error guides (#40453) 
add embedded youtube videos
provide visual debugging for top errors

PR Close #40453
2021-01-20 08:47:00 -08:00

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@name Invalid Attribute @category compiler @videoUrl https://www.youtube.com/embed/wfLkB3RsSJM @shortDescription Unknown attribute or input

@description An attribute or property cannot be resolved during compilation.

This error arises when attempting to bind to a property that does not exist. Any property binding must correspond to either:

  • A native property on the HTML element, or
  • An @Input() property of a component or directive applied to the element.

The runtime error for this is NG0304: '${tagName}' is not a known element: …’.

@debugging Look at documentation for the specific binding syntax used. This is usually a typo or incorrect import. There may also be a missing direction with property selector ‘name’ or missing input.