fix

app/design/frontend/Joshine/breeze/theme.xml

 <theme xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Config/etc/theme.xsd">
     <title>Joshine/breeze</title>
-    <media>
     <parent>Swissup/breeze-blank</parent>
+    <media>
         <preview_image>media/preview.jpg</preview_image>
     </media>
 </theme>
\ No newline at end of file