Entity 'ntilde' not defined

[gstar]

I'm getting this error from Webmaster Tools:

We were unable to read your Sitemap. It may contain an entry we are unable to recognize. Please validate your Sitemap before resubmitting.

Upon checking the sitemap it shows:

This page contains the following errors:

error on line 99 at column 101: Entity 'ntilde' not defined
Below is a rendering of the page up to the first error.

Any ideas why this is?

[Emmanuel]

Hi

yes, encoding issue. with search URLs and/or accentued URLs

To Convert special characters, especially the & found in OSClass search URLs, to HTML entities

https://github.com/osclass/plugin-sitemap_generator/pull/2

https://github.com/navjottomer/sitemap_plugin/pull/4