SEBA-538 Fix validation error message

Change-Id: I2a77653ccea0e0508075667386af48c9d1472a29
diff --git a/lib/xos-genx/xosgenx/validator.py b/lib/xos-genx/xosgenx/validator.py
index 772b0f9..bf73b84 100644
--- a/lib/xos-genx/xosgenx/validator.py
+++ b/lib/xos-genx/xosgenx/validator.py
@@ -215,7 +215,7 @@
         elif link_type == "manytomany":
             self.validate_field_link_manytomany(model, field)
         else:
-            self.error("Unknown link_type %s" % link_type)
+            self.error(model, field, "Unknown link_type %s" % link_type)
 
     def validate_field_integer(self, model, field):
         # An integer with an option "type=link" is actually a link