+function AbstractValue.add_error(self, section, type, msg)
+ self.error = self.error or { }
+ self.error[section] = msg or type
+
+ self.section.error = self.section.error or { }
+ self.section.error[section] = self.section.error[section] or { }
+ table.insert(self.section.error[section], msg or type)
+
+ if type == "invalid" then
+ self.tag_invalid[section] = true
+ elseif type == "missing" then
+ self.tag_missing[section] = true
+ end
+
+ self.tag_error[section] = true
+ self.map.save = false
+end
+