diff --git a/package.json b/package.json
index 98349d5c..12045269 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@stellar/wallet-sdk",
-  "version": "0.1.0-rc.2",
+  "version": "0.1.0-rc.3",
   "description": "Libraries to help you write Stellar-enabled wallets in Javascript",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/KeyManager.ts b/src/KeyManager.ts
index a24992c6..3e97600a 100644
--- a/src/KeyManager.ts
+++ b/src/KeyManager.ts
@@ -317,19 +317,11 @@ export class KeyManager {
     );
 
     if (challengeRes.status !== 200) {
-      try {
-        const challengeJson = await challengeRes.json();
-        throw new Error(
-          `[KeyManager#fetchAuthToken] Failed to fetch a challenge transaction,
-          error: ${challengeJson.error}`,
-        );
-      } catch (e) {
-        throw new Error(
-          `[KeyManager#fetchAuthToken] Failed to fetch a challenge transaction,
-          error code ${challengeRes.status} and status text
-          "${challengeRes.statusText}"`,
-        );
-      }
+      const challengeText = await challengeRes.text();
+      throw new Error(
+        `[KeyManager#fetchAuthToken] Failed to fetch a challenge transaction,
+          error: ${JSON.stringify(challengeText)}`,
+      );
     }
 
     const keyNetwork = key.network || this.defaultNetworkPassphrase;