diff --git a/src/controllers/employee-checkup-controller.ts b/src/controllers/employee-checkup-controller.ts
index ede52f4..07bf28c 100644
--- a/src/controllers/employee-checkup-controller.ts
+++ b/src/controllers/employee-checkup-controller.ts
@@ -51,7 +51,7 @@ export class EmployeeCheckupController extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Employee checkup cannot be found.",
-        "data_not_found",
+        "employeeCheckupNotFound",
       );
     }
     return record;
@@ -72,13 +72,13 @@ export class EmployeeCheckupController extends Controller {
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Province cannot be found.",
-          "missing_or_invalid_parameter",
+          "provinceNotFound",
         );
       if (!employee)
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Employee cannot be found.",
-          "missing_or_invalid_parameter",
+          "employeeNotFound",
         );
     }
 
@@ -116,13 +116,13 @@ export class EmployeeCheckupController extends Controller {
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Province cannot be found.",
-          "missing_or_invalid_parameter",
+          "provinceNotFound",
         );
       if (!employee)
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Employee cannot be found.",
-          "missing_or_invalid_parameter",
+          "employeeNotFound",
         );
     }
 
@@ -132,7 +132,7 @@ export class EmployeeCheckupController extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Employee checkup cannot be found.",
-        "data_not_found",
+        "employeeCheckupNotFound",
       );
     }
 
@@ -160,7 +160,7 @@ export class EmployeeCheckupController extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Employee checkup cannot be found.",
-        "data_not_found",
+        "employeeCheckupNotFound",
       );
     }
 
diff --git a/src/controllers/employee-controller.ts b/src/controllers/employee-controller.ts
index 2dc9614..ab43b07 100644
--- a/src/controllers/employee-controller.ts
+++ b/src/controllers/employee-controller.ts
@@ -295,7 +295,7 @@ export class EmployeeController extends Controller {
     });
 
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Employee cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Employee cannot be found.", "employeeNotFound");
     }
 
     return record;
@@ -316,25 +316,25 @@ export class EmployeeController extends Controller {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Province cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationProvinceNotFound",
       );
     if (body.districtId !== district?.id)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "District cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationDistrictNotFound",
       );
     if (body.subDistrictId !== subDistrict?.id)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Sub-district cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationSubDistrictNotFound",
       );
     if (!customerBranch)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Customer Branch cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationCustomerBranchNotFound",
       );
 
     const {
@@ -362,7 +362,7 @@ export class EmployeeController extends Controller {
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Some province cannot be found.",
-          "missing_or_invalid_parameter",
+          "someProvinceNotFound",
         );
       }
     }
@@ -476,28 +476,28 @@ export class EmployeeController 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.customerBranchId && !customerBranch)
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Customer cannot be found.",
-        "missing_or_invalid_parameter",
+        "relationCustomerNotFound",
       );
     if (!employee) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Employee cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Employee cannot be found.", "employeeNotFound");
     }
 
     const {
@@ -524,7 +524,7 @@ export class EmployeeController extends Controller {
         throw new HttpError(
           HttpStatus.BAD_REQUEST,
           "Some province cannot be found.",
-          "missing_or_invalid_parameter",
+          "someProvinceNotFound",
         );
       }
     }
@@ -652,14 +652,14 @@ export class EmployeeController extends Controller {
     const record = await prisma.employee.findFirst({ where: { id: employeeId } });
 
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Employee cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Employee cannot be found.", "employeeNotFound");
     }
 
     if (record.status !== Status.CREATED) {
       throw new HttpError(
         HttpStatus.FORBIDDEN,
         "Employee is in used.",
-        "missing_or_invalid_parameter",
+        "employeeInUsed",
       );
     }
 
diff --git a/src/controllers/employee-other-info-controller.ts b/src/controllers/employee-other-info-controller.ts
index 3cb6284..4a2afd3 100644
--- a/src/controllers/employee-other-info-controller.ts
+++ b/src/controllers/employee-other-info-controller.ts
@@ -54,7 +54,7 @@ export class EmployeeOtherInfo extends Controller {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Employee cannot be found.",
-        "missing_or_invalid_parameter",
+        "employeeBadReq",
       );
 
     const record = await prisma.employeeOtherInfo.create({
@@ -82,7 +82,7 @@ export class EmployeeOtherInfo extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Employee other info cannot be found.",
-        "data_not_found",
+        "employeeOtherNotFound",
       );
     }
 
@@ -106,7 +106,7 @@ export class EmployeeOtherInfo extends Controller {
       throw new HttpError(
         HttpStatus.NOT_FOUND,
         "Employee other info cannot be found.",
-        "data_not_found",
+        "employeeOtherNotFound",
       );
     }
 
diff --git a/src/controllers/employee-work-controller.ts b/src/controllers/employee-work-controller.ts
index 90f1c8b..2336874 100644
--- a/src/controllers/employee-work-controller.ts
+++ b/src/controllers/employee-work-controller.ts
@@ -46,7 +46,7 @@ export class EmployeeWorkController extends Controller {
       where: { id: workId, employeeId },
     });
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Employee work cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Employee work cannot be found.", "employeeWorkNotFound");
     }
     return record;
   }
@@ -61,7 +61,7 @@ export class EmployeeWorkController extends Controller {
       throw new HttpError(
         HttpStatus.BAD_REQUEST,
         "Employee cannot be found.",
-        "missing_or_invalid_parameter",
+        "employeeBadReq",
       );
 
     const record = await prisma.employeeWork.create({
@@ -86,7 +86,7 @@ export class EmployeeWorkController extends Controller {
     @Body() body: EmployeeWorkPayload,
   ) {
     if (!(await prisma.employeeWork.findUnique({ where: { id: workId, employeeId } }))) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Employee work cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Employee work cannot be found.", "employeeWorkNotFound");
     }
 
     const record = await prisma.employeeWork.update({
@@ -104,7 +104,7 @@ export class EmployeeWorkController extends Controller {
     const record = await prisma.employeeWork.findFirst({ where: { id: workId, employeeId } });
 
     if (!record) {
-      throw new HttpError(HttpStatus.NOT_FOUND, "Employee work cannot be found.", "data_not_found");
+      throw new HttpError(HttpStatus.NOT_FOUND, "Employee work cannot be found.", "employeeWorkNotFound");
     }
 
     return await prisma.employeeWork.delete({ where: { id: workId, employeeId } });