fix issues 389 and 3920.17.11

1 files changed, 1 insertions, 1 deletions

diff --git a/reader.py b/reader.py
index bceb790..4aac40a 100644
--- a/reader.py
+++ b/reader.py
@@ -56,7 +56,7 @@ class ReaderError(YAMLError):
             )
         else:
             return _F(
-                'unacceptable character #x{self_character:04x}: {self._reason!s}\n'
+                'unacceptable character #x{self_character:04x}: {self_reason!s}\n'
                 '  in "{self_name!s}", position {self_position:d}',
                 self_character=self.character,
                 self_reason=self.reason,