diff --git a/com/Unit/Create.lua b/com/Unit/Create.lua
index d770823..69292c1 100644
--- a/com/Unit/Create.lua
+++ b/com/Unit/Create.lua
@@ -15,6 +15,7 @@ local crypt = require("internal.crypt.bcrypt")
 local sha256 = require("internal.crypt.sha256")
 
 local common = require("com/Unit/_common")
+local errors = require("com/Unit/_errors")
 
 -- Preparing for first db query
 local function close_db()
@@ -30,7 +31,7 @@ local params = session.request.params.get()
 local ok, mp = common.CheckMissingElement({"username", "password", "email"}, params)
 if not ok then
   close_db()
-  session.response.send_error(-32602, "Missing params", mp)
+  session.response.send_error(errors.MISSING_PARAMS.code, errors.MISSING_PARAMS.message, mp)
 end
 
 local hashPass = crypt.generate(params.password, crypt.DefaultCost)
@@ -57,7 +58,7 @@ end
 
 if existing and #existing > 0 then
   close_db()
-  session.response.send_error(-32101, "Unit is already exists")
+  session.response.send_error(errors.UNIT_EXISTS.code, errors.UNIT_EXISTS.message)
 end
 
 -- Second db query: insert new unit
@@ -73,14 +74,14 @@ local ctx, err = db:exec(
 if err ~= nil then
   log.error("Insert failed: "..tostring(err))
   close_db()
-  session.response.send_error("Failed to create unit")
+  session.response.send_error(errors.DB_INSERT_FAILED.code, errors.DB_INSERT_FAILED.message)
 end
 
 local res, err = ctx:wait()
 if err ~= nil then
   log.error("Insert confirmation failed: "..tostring(err))
   close_db()
-  session.response.send_error("Failed to create unit")
+  session.response.send_error(errors.DB_INSERT_FAILED.code, errors.DB_INSERT_FAILED.message)
 end
 
 close_db()
diff --git a/com/Unit/Delete.lua b/com/Unit/Delete.lua
index be3f96b..d272b65 100644
--- a/com/Unit/Delete.lua
+++ b/com/Unit/Delete.lua
@@ -9,6 +9,7 @@ local db = require("internal.database.sqlite").connect("db/unit.db", {log = true
 local session = require("internal.session")
 
 local common = require("com/Unit/_common")
+local errors = require("com/Unit/_errors")
 
 -- Preparing for first db query
 local function close_db()
@@ -24,7 +25,7 @@ local params = session.request.params.get()
 local ok, mp = common.CheckMissingElement({"user_id"}, params)
 if not ok then
   close_db()
-  session.response.send_error(-32602, "Missing params", mp)
+  session.response.send_error(errors.MISSING_PARAMS.code, errors.MISSING_PARAMS.message, mp)
 end
 
 local existing, err = db:query([[
@@ -46,7 +47,7 @@ end
 
 if existing and #existing == 0 then
   close_db()
-  session.response.send_error(-32102, "Unit is not exists")
+  session.response.send_error(errors.UNIT_NOT_FOUND.code, errors.UNIT_NOT_FOUND.message)
 end
 
 local ctx, err = db:exec(
@@ -62,14 +63,14 @@ local ctx, err = db:exec(
 if err ~= nil then
   log.error("Soft delete failed: " .. tostring(err))
   close_db()
-  session.response.send_error("Failed to delete unit")
+  session.response.send_error(errors.DB_DELETE_FAILED.code, errors.DB_DELETE_FAILED.message)
 end
 
 local res, err = ctx:wait()
 if err ~= nil then
   log.error("Soft delete confirmation failed: " .. tostring(err))
   close_db()
-  session.response.send_error("Failed to delete unit")
+  session.response.send_error(errors.DB_DELETE_FAILED.code, errors.DB_DELETE_FAILED.message)
 end
 
 close_db()
diff --git a/com/Unit/Get.lua b/com/Unit/Get.lua
index 898c331..d89710f 100644
--- a/com/Unit/Get.lua
+++ b/com/Unit/Get.lua
@@ -9,6 +9,7 @@ local db = require("internal.database.sqlite").connect("db/unit.db", {log = true
 local session = require("internal.session")
 
 local common = require("com/Unit/_common")
+local errors = require("com/Unit/_errors")
 
 -- Preparing for first db query
 local function close_db()
@@ -24,12 +25,12 @@ local params = session.request.params.get()
 local ok, mp = common.CheckMissingElement({"by", "value"}, params)
 if not ok then
   close_db()
-  session.response.send_error(-32602, "Missing params", mp)
+  session.response.send_error(errors.MISSING_PARAMS.code, errors.MISSING_PARAMS.message, mp)
 end
 
 if not (params.by == "email" or params.by == "username" or params.by == "user_id") then
   close_db()
-  session.response.send_error(-32602, "Invalid 'by' param")
+  session.response.send_error(errors.INVALID_BY_PARAM.code, errors.INVALID_BY_PARAM.message)
 end
 
 local unit, err = db:query_row(
@@ -42,12 +43,12 @@ local unit, err = db:query_row(
 if err then
   close_db()
   log.error("DB query error: " .. tostring(err))
-  session.response.send_error("Database query failed")
+  session.response.send_error()
 end
 
 if not unit then
   close_db()
-  session.response.send_error(-32102, "Unit is not exists")
+  session.response.send_error(errors.UNIT_NOT_FOUND.code, errors.UNIT_NOT_FOUND.message)
 end
 
 close_db()