This error is typically occurs in web browsers when you click on a link that has an unsupported or unknown URL scheme. The URL scheme is the part of a URL that identifies the type of resource being requested, such as "http://" for web pages or "mailto:" for email links. For ex: You may get this "ERR_UNKNOWN_URL_SCHEME error" during mailto: or tel: links inside an iframe.
To solve it, try to add target="_blank" in your URL Scheme/Code.
<a href="mailto:my@email.com" target="_blank">link text</a>
This error "[ERR_UNKNOWN_URL_SCHEME]" has no any specific solution till now. Android user and PC user all are facing this error which needs to be sought out. There's a long-standing bug in Chromium regarding how links without protocols are handled. It occasionally is patched, but seems to keep resurfacing. In some cases, prefixing your links with http:// (or https://) should resolve the issue for you.
Here are some steps you can take to try to solve the "ERR_UNKNOWN_URL_SCHEME" error:
Double-check the URL to make sure it is correct and includes the appropriate scheme. If you are clicking on a link, try copying and pasting the URL into the browser's address bar instead.
Some browser extensions can interfere with URL schemes. Try disabling any extensions you have installed and see if the error goes away.
If the error persists, try using a different web browser to see if the issue is specific to your current browser.
