diff --git a/pkg/filesystem/errors.go b/pkg/filesystem/errors.go
index 303d0d5..d267038 100644
--- a/pkg/filesystem/errors.go
+++ b/pkg/filesystem/errors.go
@@ -8,17 +8,17 @@ import (
 
 var (
 	ErrUnknownPolicyType        = serializer.NewError(serializer.CodeInternalSetting, "Unknown policy type", nil)
-	ErrFileSizeTooBig           = serializer.NewError(serializer.CodeFileTooLarge, "", nil)
-	ErrFileExtensionNotAllowed  = serializer.NewError(serializer.CodeFileTypeNotAllowed, "", nil)
-	ErrInsufficientCapacity     = serializer.NewError(serializer.CodeInsufficientCapacity, "", nil)
-	ErrIllegalObjectName        = serializer.NewError(serializer.CodeIllegalObjectName, "", nil)
+	ErrFileSizeTooBig           = serializer.NewError(serializer.CodeFileTooLarge, "File is too large", nil)
+	ErrFileExtensionNotAllowed  = serializer.NewError(serializer.CodeFileTypeNotAllowed, "File type not allowed", nil)
+	ErrInsufficientCapacity     = serializer.NewError(serializer.CodeInsufficientCapacity, "Insufficient capacity", nil)
+	ErrIllegalObjectName        = serializer.NewError(serializer.CodeIllegalObjectName, "Invalid object name", nil)
 	ErrClientCanceled           = errors.New("Client canceled operation")
-	ErrRootProtected            = serializer.NewError(serializer.CodeRootProtected, "", nil)
+	ErrRootProtected            = serializer.NewError(serializer.CodeRootProtected, "Root protected", nil)
 	ErrInsertFileRecord         = serializer.NewError(serializer.CodeDBError, "Failed to create file record", nil)
-	ErrFileExisted              = serializer.NewError(serializer.CodeObjectExist, "", nil)
-	ErrFileUploadSessionExisted = serializer.NewError(serializer.CodeConflictUploadOngoing, "", nil)
-	ErrPathNotExist             = serializer.NewError(serializer.CodeParentNotExist, "", nil)
-	ErrObjectNotExist           = serializer.NewError(serializer.CodeParentNotExist, "", nil)
+	ErrFileExisted              = serializer.NewError(serializer.CodeObjectExist, "Object existed", nil)
+	ErrFileUploadSessionExisted = serializer.NewError(serializer.CodeConflictUploadOngoing, "Upload session existed", nil)
+	ErrPathNotExist             = serializer.NewError(serializer.CodeParentNotExist, "Path not exist", nil)
+	ErrObjectNotExist           = serializer.NewError(serializer.CodeParentNotExist, "Object not exist", nil)
 	ErrIO                       = serializer.NewError(serializer.CodeIOFailed, "Failed to read file data", nil)
 	ErrDBListObjects            = serializer.NewError(serializer.CodeDBError, "Failed to list object records", nil)
 	ErrDBDeleteObjects          = serializer.NewError(serializer.CodeDBError, "Failed to delete object records", nil)