diff --git a/src/iam.ts b/src/iam.ts
index 7c2c70c5..ea5576d1 100644
--- a/src/iam.ts
+++ b/src/iam.ts
@@ -211,7 +211,7 @@ export class IAM extends IAMBase {
                     realtimeExchangeConnected: false,
                 };
             }
-            throw new Error(err);
+            throw new Error(err.message);
         }
 
         return {