diff --git a/barobill_registration/api.php b/barobill_registration/api.php
index 960efd8..fcb23e0 100644
--- a/barobill_registration/api.php
+++ b/barobill_registration/api.php
@@ -1,9 +1,13 @@
 <?php
 header('Content-Type: application/json');
-require_once("../lib/mydb.php");
-
 $method = $_SERVER['REQUEST_METHOD'];
+
 try {
+    if (!file_exists("../lib/mydb.php")) {
+        throw new Exception("Required library file ../lib/mydb.php not found.");
+    }
+    require_once("../lib/mydb.php");
+
     $pdo = db_connect();
 
     switch ($method) {
@@ -24,7 +28,7 @@ try {
             echo json_encode(['error' => 'Method not allowed']);
             break;
     }
-} catch (Exception $e) {
+} catch (Throwable $e) {
     http_response_code(500);
     echo json_encode([
         'error' => 'Backend Error',
diff --git a/barobill_registration/index.php b/barobill_registration/index.php
index 9c52fb5..a7a1bd5 100644
--- a/barobill_registration/index.php
+++ b/barobill_registration/index.php
@@ -213,7 +213,7 @@
                         setMembers(data.members || []);
                     } catch (parseError) {
                         console.error("Invalid JSON response:", text);
-                        alert("서버로부터 올바르지 않은 응답이 수신되었습니다. DB 연결 또는 테이블 생성 여부를 확인해주세요.");
+                        alert("서버로부터 올바르지 않은 응답이 수신되었습니다.\n\n[응답 내용]\n" + text.substring(0, 200) + (text.length > 200 ? '...' : '') + "\n\n요소: DB 연동 또는 테이블(init_db.php) 상태를 확인해주세요.");
                     }
                 } catch (e) { 
                     console.error(e); 
diff --git a/barobill_registration/init_db.php b/barobill_registration/init_db.php
index 6773c97..fb6abc4 100644
--- a/barobill_registration/init_db.php
+++ b/barobill_registration/init_db.php
@@ -1,11 +1,14 @@
 <?php
-require_once("../lib/mydb.php");
-
 try {
+    if (!file_exists("../lib/mydb.php")) {
+        throw new Exception("Required library file ../lib/mydb.php not found.");
+    }
+    require_once("../lib/mydb.php");
+
     $pdo = db_connect();
     $sql = file_get_contents("schema.sql");
     $pdo->exec($sql);
     echo "Table 'barobill_members' initialized successfully.";
-} catch (Exception $e) {
-    echo "Error: " . $e->getMessage();
+} catch (Throwable $e) {
+    echo "Error: [" . get_class($e) . "] " . $e->getMessage();
 }