chore: change execption error message

solidify-xml/src/main/java/ch/unige/solidify/util/XMLTool.java

@@ -236,7 +236,7 @@ public class XMLTool {
       validator.validate(new DOMSource(doc));
 
     } catch (ParserConfigurationException | SAXException | IOException e) {
-      throw new SolidifyCheckingException(logValidationError(xml, xsd), e);
+      throw new SolidifyCheckingException(e.getMessage(), e);
     }
   }