Message
IRI found where URL expected
Explanation
All link
and url
elements MUST be valid URLs.
An Internationalized Resource Identifier (IRI) provides a means to identify Internet resources using non-ASCII characters that can't be present in URLs.
Solution
An IRI that contains non-ASCII characters MUST be converted to a URL using the procedure described in RFC 3987
Not clear? Disagree?
You might be able to find help in one of these fine resources.