diff --git a/src/controllers/branch-contact-controller.ts b/src/controllers/branch-contact-controller.ts
index 473fd51..e2e3d6c 100644
--- a/src/controllers/branch-contact-controller.ts
+++ b/src/controllers/branch-contact-controller.ts
@@ -62,7 +62,7 @@ export class BranchContactController extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Branch contact cannot be found.",
-        "data_not_found",
+        "branchContactNotFound",
       );
     }
 
@@ -78,8 +78,8 @@ export class BranchContactController extends Controller {
     if (!(await prisma.branch.findFirst({ where: { id: branchId } }))) {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
-        "Branch not found.",
-        "missing_or_invalid_parameter",
+        "Branch cannot be found.",
+        "branchBadReq",
       );
     }
     const record = await prisma.branchContact.create({
@@ -106,7 +106,7 @@ export class BranchContactController extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Branch contact cannot be found.",
-        "data_not_found",
+        "branchContactNotFound",
       );
     }
 
@@ -125,7 +125,7 @@ export class BranchContactController extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Branch contact cannot be found.",
-        "data_not_found",
+        "branchContactNotFound",
       );
     }
   }
diff --git a/src/controllers/branch-controller.ts b/src/controllers/branch-controller.ts
index 889c5a1..bf61974 100644
--- a/src/controllers/branch-controller.ts
+++ b/src/controllers/branch-controller.ts
@@ -208,7 +208,7 @@ export class BranchController extends Controller {
     });
 
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "branchNotFound");
     }
 
     return Object.assign(record, {
@@ -229,25 +229,25 @@ export class BranchController extends Controller {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Province cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationProvinceNotFound",
       );
     if (body.districtId && !district)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "District cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationDistrictNotFound",
       );
     if (body.subDistrictId && !subDistrict)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Sub-district cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationSubDistrictNotFound",
       );
     if (body.headOfficeId && !head)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
-        "Head branch cannot be found.",
-        "missing_or_invalid_parameter",
+        "Headquaters cannot be found.",
+        "relationHQNotFound",
       );
 
     const { provinceId, districtId, subDistrictId, headOfficeId, contact, ...rest } = body;
@@ -337,8 +337,8 @@ export class BranchController extends Controller {
     if (body.headOfficeId === branchId)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
-        "Cannot make this as head office and branch at the same time.",
-        "missing_or_invalid_parameter",
+        "Cannot make this as headquaters and branch at the same time.",
+        "cantMakeHQAndBranchSameTime",
       );
 
     if (body.subDistrictId || body.districtId || body.provinceId || body.headOfficeId) {
@@ -352,32 +352,32 @@ export class BranchController extends Controller {
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Province cannot be found.",
-          "missing_or_invalid_parameter",
+          "relationProvinceNotFound",
         );
       if (body.districtId && !district)
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "District cannot be found.",
-          "missing_or_invalid_parameter",
+          "relationDistrictNotFound",
         );
       if (body.subDistrictId && !subDistrict)
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Sub-district cannot be found.",
-          "missing_or_invalid_parameter",
+          "relationSubDistrictNotFound",
         );
       if (body.headOfficeId && !branch)
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
-          "Head branch cannot be found.",
-          "missing_or_invalid_parameter",
+          "Headquaters cannot be found.",
+          "relationHQNotFound",
         );
     }
 
     const { provinceId, districtId, subDistrictId, headOfficeId, contact, ...rest } = body;
 
     if (!(await prisma.branch.findUnique({ where: { id: branchId } }))) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "branchNotFound");
     }
 
     const record = await prisma.branch.update({
@@ -445,11 +445,11 @@ export class BranchController extends Controller {
     });
 
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Branch cannot be found.", "branchNotFound");
     }
 
     if (record.status !== Status.CREATED) {
-      throw new HttpError(HttpStatus.FORBIDDEN, "Branch is in used.", "data_in_used");
+      throw new HttpError(HttpStatus.FORBIDDEN, "Branch is in used.", "branchInUsed");
     }
 
     await minio.removeObject(MINIO_BUCKET, lineImageLoc(branchId), {
diff --git a/src/controllers/branch-user-controller.ts b/src/controllers/branch-user-controller.ts
index a12c546..539dd2e 100644
--- a/src/controllers/branch-user-controller.ts
+++ b/src/controllers/branch-user-controller.ts
@@ -116,7 +116,7 @@ export class BranchUserController extends Controller {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Branch cannot be found.",
-        "missing_or_invalid_parameter",
+        "branchBadReq",
       );
     }
 
@@ -124,7 +124,7 @@ export class BranchUserController extends Controller {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "One or more user cannot be found.",
-        "missing_or_invalid_parameter",
+        "oneOrMoreUserBadReq",
       );
     }
 
@@ -234,7 +234,7 @@ export class UserBranchController extends Controller {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "One or more branch cannot be found.",
-        "missing_or_invalid_parameter",
+        "oneOrMoreBranchBadReq",
       );
     }