This error message is usually seen when you are trying to open a URL in your web browser or in a web view component, but the URL has an invalid or unsupported scheme.

For example, if you try to open a URL with the scheme “abc://example.com” in your web browser, you will see this error message because “abc” is not a valid or supported scheme in most web browsers.

To fix this error, you need to make sure that the URL you are trying to open has a valid and supported scheme. Some common examples of valid schemes for URLs are “http”, “https”, “ftp”, “file”, and “data”.

If you are trying to open a URL with a custom scheme in your web browser or web view component, you may need to register a handler for that scheme. This can usually be done by using the appropriate APIs provided by the web browser or web view component.

For example, in Chrome, you can use the “registerProtocolHandler” API to register a handler for a custom URL scheme. In Android, you can use the “intent-filter” feature in your app’s manifest file to register a handler for a custom URL scheme.