18 lines
1.0 KiB
Markdown
18 lines
1.0 KiB
Markdown
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@name Invalid Element
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@category compiler
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@shortDescription Unknown HTML element or component
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@description
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One or more elements cannot be resolved during compilation because the element is not defined by the HTML spec, or there is no component or directive with such element selector.
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The runtime error for this is `NG0304: '${tagName}' is not a known element: …’`.
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@debugging
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Use the element name in the error to find the file(s) where the element is being used.
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Check that the name and selector are correct. If the component is from a different module or import, check that the component is exported from its origin module and imported into the correct `*.modules.ts` file, and declared in the imports list.
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When using custom elements or web components, ensure that you add [`CUSTOM_ELEMENTS_SCHEMA`](https://angular.io/api/core/CUSTOM_ELEMENTS_SCHEMA) to the app module.
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If this does not resolve the error, check the imported libraries for any recent changes to the exports and properties you are using, and restart your server.
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