sitemap.xml doesn't pass validation

[Jchen]

I have installed a trial version on my server to generate sitemap, and then I used the generated sitemap.xml to run the validation test at https://www.xml-sitemaps.com/validate-xml-sitemap.html.
The sitemap.xml did not pass validation and the error seemed to result from unicode characters in urls.
Here is my sitemap: [ External links are visible to forum administrators only ]

I see there's an UTF8 charset checkbox but I don't know if I should check it or not.
I use some other character set like "BIG5".


Thank you!

[XML-Sitemaps Support]

Hello,

I have tried your sitemap with validator and got no errors for it:

The schema(s) used for schema-validation had
  no errorsNo schema-validity problems were found in the target