In-Page Analytics uses the Website's URL option in your view to identify the page in your site on which the In-Page Analytics report launches. If the URL for your website uses characters that are not part of the standard UTF-8 character set (for example, Cyrillic characters), you cannot use that URL when you create a view: when you enter a URL with non-standard characters, Analytics returns an error.
If you want to use In-Page Analytics and the URL for your website includes characters that are not part of the standard UTF-8 character set, you need to use a punycode translation of your URL when you create a view. In-Page Analytics can correctly identify your page using the punycode URL, but your real URL will be the one that is displayed in the report.
You can use a punycode converter like this one to convert non-standard URLs to punycode.