diff --git a/src/app/actions/get-papers-by-id.ts b/src/app/actions/get-papers-by-id.ts
index 6909aa6..cb92e87 100644
--- a/src/app/actions/get-papers-by-id.ts
+++ b/src/app/actions/get-papers-by-id.ts
@@ -15,6 +15,10 @@ export const fetchPaperID = async (id: string): Promise<PaperResponse> => {
     return response.data.data;
   } catch (err: unknown) {
     if (axios.isAxiosError<ApiResponse<unknown>>(err)) {
+      const status = err.response?.status;
+      if (status === 400 || status === 404) {
+        throw err;
+      }
       const errorMessage = err.response?.data?.message ?? err.message;
       console.error("Axios error:", errorMessage);
       throw new Error(errorMessage);
diff --git a/src/app/api/paper-by-id/[id]/route.ts b/src/app/api/paper-by-id/[id]/route.ts
index 28b88c4..f70881e 100644
--- a/src/app/api/paper-by-id/[id]/route.ts
+++ b/src/app/api/paper-by-id/[id]/route.ts
@@ -1,21 +1,22 @@
 import { Types } from "mongoose";
 import { getPaperById } from "@/lib/services/paper";
 import { success, failure } from "@/lib/utils/response"
+import { customErrorHandler } from "@/lib/utils/error";
 
 export const dynamic = "force-dynamic";
 
 export async function GET(req: Request, { params }: { params: { id: string } }) {
   try {
     const { id } = params;
-    
+
     if (!Types.ObjectId.isValid(id)) {
       return failure("Invalid paper ID");
     }
     const paper = await getPaperById(id);
-    
+
     return success(paper);
   } catch (error) {
     console.error(error);
-    return failure("Failed to fetch paper", 500);
+    return customErrorHandler(error, "Failed to fetch paper");
   }
 }
diff --git a/src/lib/services/paper.ts b/src/lib/services/paper.ts
index 4eb52f4..10b1a93 100644
--- a/src/lib/services/paper.ts
+++ b/src/lib/services/paper.ts
@@ -7,6 +7,7 @@ import CourseCount from "@/db/course";
 import PaperRequest from "@/db/paperRequest";
 import { type StoredSubjects } from "@/interface";
 import { transformPapersToSubjectSlots } from "@/lib/services/paper-transform";
+import { CustomError } from "@/lib/utils/error";
 
 export interface CreatePaperInputType {
   subject: string;
@@ -40,7 +41,7 @@ export async function getPaperById(id: string) {
 	const paper = await Paper.findById(id);
 
 	if (!paper) {
-		throw new Error("Paper not found"); // 404
+		throw new CustomError("paper not found", 404);
 	}
 
 	return paper;