1 files changed, 13 insertions, 2 deletions
diff --git a/sphinx/errors.py b/sphinx/errors.py
index 5db68dd..44df3e8 100644
--- a/sphinx/errors.py
+++ b/sphinx/errors.py
@@ -25,16 +25,19 @@ class SphinxError(Exception):
        exception to a string ("category: message").  Should be set accordingly
        in subclasses.
     """
+
     category = 'Sphinx error'
 
 
 class SphinxWarning(SphinxError):
     """Warning, treated as error."""
+
     category = 'Warning, treated as error'
 
 
 class ApplicationError(SphinxError):
     """Application initialization error."""
+
     category = 'Application error'
 
 
@@ -42,7 +45,7 @@ class ExtensionError(SphinxError):
     """Extension error."""
 
     def __init__(
-        self, message: str, orig_exc: Exception | None = None, modname: str | None = None,
+        self, message: str, orig_exc: Exception | None = None, modname: str | None = None
     ) -> None:
         super().__init__(message)
         self.message = message
@@ -70,26 +73,31 @@ class ExtensionError(SphinxError):
 
 class BuildEnvironmentError(SphinxError):
     """BuildEnvironment error."""
+
     category = 'BuildEnvironment error'
 
 
 class ConfigError(SphinxError):
     """Configuration error."""
+
     category = 'Configuration error'
 
 
 class DocumentError(SphinxError):
     """Document error."""
+
     category = 'Document error'
 
 
 class ThemeError(SphinxError):
     """Theme error."""
+
     category = 'Theme error'
 
 
 class VersionRequirementError(SphinxError):
     """Incompatible Sphinx version error."""
+
     category = 'Sphinx version error'
 
 
@@ -118,10 +126,13 @@ class PycodeError(Exception):
 
 class NoUri(Exception):
     """Raised by builder.get_relative_uri() or from missing-reference handlers
-    if there is no URI available."""
+    if there is no URI available.
+    """
+
     pass
 
 
 class FiletypeNotFoundError(Exception):
     """Raised by get_filetype() if a filename matches no source suffix."""
+
     pass