diff --git a/openflow_input/standard-1.2 b/openflow_input/standard-1.2
index e8f95ee..589d7bf 100644
--- a/openflow_input/standard-1.2
+++ b/openflow_input/standard-1.2
@@ -410,7 +410,7 @@
     OFPRRFC_BAD_ROLE = 2,
 };
 
-enum ofp_stats_types(wire_type=uint16_t) {
+enum ofp_stats_type(wire_type=uint16_t) {
     OFPST_DESC = 0,
     OFPST_FLOW = 1,
     OFPST_AGGREGATE = 2,
@@ -569,7 +569,7 @@
     uint32_t n_buffers;
     uint8_t n_tables;
     pad(3);
-    uint32_t capabilities;
+    enum ofp_capabilities capabilities;
     uint32_t reserved;
     list(of_port_desc_t) ports;
 };
@@ -954,21 +954,139 @@
     uint8_t type == 1;
     uint16_t length;
     uint32_t xid;
-    uint16_t err_type;
-    uint16_t code;
+    uint16_t err_type == ?;
+};
+
+struct of_hello_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 0;
+    enum ofp_hello_failed_code code;
     of_octets_t data;
 };
 
-// struct of_error_experimenter_msg {
-//    uint8_t version;
-//    uint8_t type;
-//    uint16_t length;
-//    uint32_t xid;
-//    uint16_t err_type;
-//    uint16_t subtype;
-//    uint32_t experimenter;
-//    of_octets_t data;
-//};
+struct of_bad_request_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 1;
+    enum ofp_bad_request_code code;
+    of_octets_t data;
+};
+
+struct of_bad_action_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 2;
+    enum ofp_bad_action_code code;
+    of_octets_t data;
+};
+
+struct of_bad_instruction_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 3;
+    enum ofp_bad_instruction_code code;
+    of_octets_t data;
+};
+
+struct of_bad_match_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 4;
+    enum ofp_bad_match_code code;
+    of_octets_t data;
+};
+
+struct of_flow_mod_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 5;
+    enum ofp_flow_mod_failed_code code;
+    of_octets_t data;
+};
+
+struct of_group_mod_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 6;
+    enum ofp_group_mod_failed_code code;
+    of_octets_t data;
+};
+
+struct of_port_mod_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 7;
+    enum ofp_port_mod_failed_code code;
+    of_octets_t data;
+};
+
+struct of_table_mod_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 8;
+    enum ofp_table_mod_failed_code code;
+    of_octets_t data;
+};
+
+struct of_queue_op_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 9;
+    enum ofp_queue_op_failed_code code;
+    of_octets_t data;
+};
+
+struct of_switch_config_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 10;
+    enum ofp_switch_config_failed_code code;
+    of_octets_t data;
+};
+
+struct of_role_request_failed_error_msg : of_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 11;
+    enum ofp_role_request_failed_code code;
+    of_octets_t data;
+};
+
+struct of_experimenter_error_msg {
+    uint8_t version;
+    uint8_t type == 1;
+    uint16_t length;
+    uint32_t xid;
+    uint16_t err_type == 0xffff;
+    uint16_t subtype;
+    uint32_t experimenter;
+    of_octets_t data;
+};
 
 // STATS ENTRIES: flow, table, port, queue, group stats, group desc stats
 // FIXME: Verify disambiguation w/ length in object and entry