--- a/devtools/server/actors/errordocs.js
+++ b/devtools/server/actors/errordocs.js
@@ -80,16 +80,17 @@ const ErrorDocs = {
   JSMSG_BAD_URI: "Malformed_URI",
   JSMSG_DEPRECATED_DELETE_OPERAND: "Delete_in_strict_mode",
   JSMSG_MISSING_FORMAL: "Missing_formal_parameter",
   JSMSG_CANT_TRUNCATE_ARRAY: "Non_configurable_array_element",
   JSMSG_INCOMPATIBLE_PROTO: "Called_on_incompatible_type",
   JSMSG_INCOMPATIBLE_METHOD: "Called_on_incompatible_type",
   JSMSG_BAD_INSTANCEOF_RHS: "invalid_right_hand_side_instanceof_operand",
   JSMSG_EMPTY_ARRAY_REDUCE: "Reduce_of_empty_array_with_no_initial_value",
+  JSMSG_NOT_ITERABLE: "is_not_iterable",
 };
 
 const MIXED_CONTENT_LEARN_MORE = "https://developer.mozilla.org/docs/Web/Security/Mixed_content";
 const TRACKING_PROTECTION_LEARN_MORE = "https://developer.mozilla.org/Firefox/Privacy/Tracking_Protection";
 const INSECURE_PASSWORDS_LEARN_MORE = "https://developer.mozilla.org/docs/Web/Security/Insecure_passwords";
 const PUBLIC_KEY_PINS_LEARN_MORE = "https://developer.mozilla.org/docs/Web/HTTP/Public_Key_Pinning";
 const STRICT_TRANSPORT_SECURITY_LEARN_MORE = "https://developer.mozilla.org/docs/Web/HTTP/Headers/Strict-Transport-Security";
 const WEAK_SIGNATURE_ALGORITHM_LEARN_MORE = "https://developer.mozilla.org/docs/Web/Security/Weak_Signature_Algorithm";