Currency switcher

Currency switcher does not work, do nothing. When i manualy put https://lesia-nails.com/pos?wmc-currency=EUR
there is a error

XML Parsing Error: syntax error
Location: https://lesia-nails.com/pos?wmc-currency=EUR
Line Number 1, Column 9:

——–^

Can u help me out, im trying free versions of your plugins before buying and implementing for my clients sites.

The page I need help with: [log in to see the link]