diff --git a/internal/cerr/cerr.go b/internal/cerr/cerr.go
new file mode 100644
index 0000000..57f4431
--- /dev/null
+++ b/internal/cerr/cerr.go
@@ -0,0 +1,28 @@
+package cerr
+
+// Error allows you to create constant "const" error with type boxing.
+type Error string
+
+// Error implements the error builtin interface.
+func (err Error) Error() string {
+	return string(err)
+}
+
+// Wrap returns a new error which wraps a new error into itself.
+func (err Error) Wrap(e error) *WrapError {
+	return &WrapError{
+		base: err,
+		wrap: e,
+	}
+}
+
+// WrapError is way to wrap errors recursively.
+type WrapError struct {
+	base error
+	wrap error
+}
+
+// Error implements the error builtin interface recursively.
+func (err *WrapError) Error() string {
+	return err.base.Error() + ": " + err.wrap.Error()
+}
diff --git a/internal/config/config.go b/internal/config/config.go
index d71b1c9..2634234 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -26,7 +26,7 @@ type Parameter struct {
 // Method represents a method definition (from api.json)
 type Method struct {
 	Description string                `json:"info"`
-	Permission  [][]string            `json:"scope"`
+	Scope       [][]string            `json:"scope"`
 	Parameters  map[string]*Parameter `json:"in"`
 	Download    *bool                 `json:"download"`
 }
diff --git a/internal/config/service.go b/internal/config/service.go
index 34f5407..0b46b18 100644
--- a/internal/config/service.go
+++ b/internal/config/service.go
@@ -6,8 +6,16 @@ import (
 	"io"
 	"net/http"
 	"strings"
+
+	"git.xdrm.io/go/aicra/internal/cerr"
 )
 
+// ErrReadConfig - a problem ocurred when trying to read the configuration file
+const ErrReadConfig = cerr.Error("cannot read config")
+
+// ErrFormatConfig - a invalid format has been detected
+const ErrFormatConfig = cerr.Error("invalid config format")
+
 // Parse builds a service from a json reader and checks for most format errors.
 func Parse(r io.Reader) (*Service, error) {
 
@@ -15,12 +23,13 @@ func Parse(r io.Reader) (*Service, error) {
 
 	err := json.NewDecoder(r).Decode(receiver)
 	if err != nil {
-		return nil, err
+		return nil, ErrReadConfig.Wrap(err)
 	}
 
+	ErrFormatConfig.Wrap(fmt.Errorf("blable"))
 	err = receiver.checkAndFormat("/")
 	if err != nil {
-		return nil, err
+		return nil, ErrFormatConfig.Wrap(err)
 	}
 
 	return receiver, nil
diff --git a/server.go b/server.go
index 2fd35c9..cd6cfff 100644
--- a/server.go
+++ b/server.go
@@ -132,7 +132,7 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	/* (6) Execute handler and return response
 	---------------------------------------------------------*/
 	// 1. feed request with configuration scope
-	request.Scope = methodDef.Permission
+	request.Scope = methodDef.Scope
 
 	// 1. execute
 	response := api.NewResponse()