Resolve "Some of the used errors do not provide useful information"

Description

#224 (closed)

controller/nucleus/errors/errors.go

@@ -162,13 +162,13 @@ func (e ErrTypeNotSupported) Error() string {
 // ErrCouldNotMarshall implements Error interface and is called if a
 // database respone can not be parsed.
 type ErrCouldNotMarshall struct {
-	Object any
-	Type   any
-	Err    error
+	Identifier any
+	Type       any
+	Err        error
 }
 
 func (e ErrCouldNotMarshall) Error() string {
-	return fmt.Sprintf("could not marshall Object: %v of Type: %v, Internal error: %v", e.Object, e.Type, e.Err)
+	return fmt.Sprintf("could not marshall Identifier: %v of Type: %v, Internal error: %v", e.Identifier, e.Type, e.Err)
 }
 
 // ErrCouldNotUpdate implements the Error interface and is called if a