[commands] Raise appropriate exception for no guild found

discord/ext/commands/parameters.py

@@ -30,7 +30,7 @@ from typing import TYPE_CHECKING, Any, Literal, Optional, OrderedDict, Union
 
 from discord.utils import MISSING, maybe_coroutine
 
-from .errors import MissingRequiredArgument
+from .errors import NoPrivateMessage
 
 if TYPE_CHECKING:
     from typing_extensions import Self
@@ -229,7 +229,7 @@ CurrentChannel = parameter(
 def default_guild(ctx: Context) -> Guild:
     if ctx.guild is not None:
         return ctx.guild
-    raise MissingRequiredArgument(ctx.current_parameter)  # type: ignore  # this is never going to be None
+    raise NoPrivateMessage()
 
 
 CurrentGuild = parameter(

docs/ext/commands/api.rst

@@ -454,7 +454,7 @@ Defaults
 
 .. data:: discord.ext.commands.CurrentGuild
 
-    A default :class:`.Parameter` which returns the :attr:`~.Context.guild` for this context. This will never be ``None``.
+    A default :class:`.Parameter` which returns the :attr:`~.Context.guild` for this context. This will never be ``None``. If the command is called in a DM context then :exc:`~discord.ext.commands.NoPrivateMessage` is raised to the error handlers.
 
     .. versionadded:: 2.0