diff --git a/entrypoint.go b/entrypoint.go
index 62438c5..4b6e214 100644
--- a/entrypoint.go
+++ b/entrypoint.go
@@ -11,13 +11,13 @@ import (
 type LibDataEnum int
 
 const (
-	INVALID    LibDataEnum = iota
+	INVALID             LibDataEnum = iota
 	DATA_RESOURCE                   = utils.DATA_RESOURCE
 	PROCESSING_RESOURCE             = utils.PROCESSING_RESOURCE
 	STORAGE_RESOURCE                = utils.STORAGE_RESOURCE
 	DATACENTER_RESOURCE             = utils.DATACENTER_RESOURCE
 	WORKFLOW_RESOURCE               = utils.WORKFLOW_RESOURCE
-	WORKFLOW						= utils.WORKFLOW
+	WORKFLOW                        = utils.WORKFLOW
 )
 
 func (d LibDataEnum) EnumIndex() int {
@@ -26,8 +26,8 @@ func (d LibDataEnum) EnumIndex() int {
 
 type LibData struct {
 	Data utils.DBObject `bson:"data" json:"data"`
-	Code int		   	`bson:"code" json:"code"`
-	Err  error          `bson:"error" json:"error"`
+	Code int            `bson:"code" json:"code"`
+	Err  string         `bson:"error" json:"error"`
 }
 
 func Init(appName string) {
@@ -42,27 +42,27 @@ func GetLogger() zerolog.Logger {
 
 func LoadOne(collection LibDataEnum, id string) LibData {
 	d, code, err := models.Model(collection.EnumIndex()).GetAccessor().LoadOne(id)
-	return LibData{Data: d, Code: code, Err: err}
+	return LibData{Data: d, Code: code, Err: err.Error()}
 }
 
 func UpdateOne(collection LibDataEnum, set map[string]interface{}, id string) LibData {
 	d, code, err := models.Model(collection.EnumIndex()).GetAccessor().UpdateOne(set, id)
-	return LibData{Data: d, Code: code, Err: err}
+	return LibData{Data: d, Code: code, Err: err.Error()}
 }
 
 func DeleteOne(collection LibDataEnum, id string) LibData {
 	d, code, err := models.Model(collection.EnumIndex()).GetAccessor().DeleteOne(id)
-	return LibData{Data: d, Code: code, Err: err}
+	return LibData{Data: d, Code: code, Err: err.Error()}
 }
 
 func StoreOne(collection LibDataEnum, object map[string]interface{}) LibData {
 	model := models.Model(collection.EnumIndex())
 	d, code, err := model.GetAccessor().StoreOne(model.Deserialize(object))
-	return LibData{Data: d, Code: code, Err: err}
+	return LibData{Data: d, Code: code, Err: err.Error()}
 }
 
 func CopyOne(collection LibDataEnum, object map[string]interface{}) LibData {
 	model := models.Model(collection.EnumIndex())
 	d, code, err := model.GetAccessor().CopyOne(model.Deserialize(object))
-	return LibData{Data: d, Code: code, Err: err}
-}
\ No newline at end of file
+	return LibData{Data: d, Code: code, Err: err.Error()}
+}
diff --git a/models/resources/datacenter/datacenter_test.go b/models/resources/datacenter/datacenter_test.go
index 26271ae..a5ab812 100644
--- a/models/resources/datacenter/datacenter_test.go
+++ b/models/resources/datacenter/datacenter_test.go
@@ -10,7 +10,7 @@ import (
 )
 
 func TestStoreOneDatacenter(t *testing.T) {
-	dc := DatacenterResource{Owner: "toto", BookingPrice: 123,
+	dc := DatacenterResource{BookingPrice: 123,
 		AbstractResource: resources.AbstractResource{
 			AbstractObject: utils.AbstractObject{Name: "testDatacenter"},
 			Description:    "Lorem Ipsum",
@@ -28,7 +28,7 @@ func TestStoreOneDatacenter(t *testing.T) {
 }
 
 func TestLoadOneDatacenter(t *testing.T) {
-	dc := DatacenterResource{Owner: "toto", BookingPrice: 123,
+	dc := DatacenterResource{BookingPrice: 123,
 		AbstractResource: resources.AbstractResource{
 			AbstractObject: utils.AbstractObject{Name: "testDatacenter"},
 			Description:    "Lorem Ipsum",