diff --git a/PFERD/crawler.py b/PFERD/crawler.py
index 2785e41..1269ba2 100644
--- a/PFERD/crawler.py
+++ b/PFERD/crawler.py
@@ -13,7 +13,8 @@ from .authenticator import Authenticator
 from .config import Config, Section
 from .limiter import Limiter
 from .logging import ProgressBar, log
-from .output_dir import FileSink, OnConflict, OutputDirectory, Redownload
+from .output_dir import FileSink, OnConflict, OutputDirectory, OutputDirError, Redownload
+from .report import MarkConflictError, MarkDuplicateError
 from .transformer import Transformer
 from .version import NAME, VERSION
 
@@ -45,12 +46,10 @@ def noncritical(f: Wrapped) -> Wrapped:
 
         try:
             f(*args, **kwargs)
-        except CrawlWarning as e:
-            log.print(f"[bold bright_red]Warning[/] {escape(str(e))}")
+        except (CrawlWarning, OutputDirError, MarkDuplicateError, MarkConflictError) as e:
+            log.warn(str(e))
             crawler.error_free = False
-        except CrawlError as e:
-            # TODO Don't print error, just pass it on upwards
-            log.print(f"[bold bright_red]Error[/] [red]{escape(str(e))}")
+        except CrawlError:
             crawler.error_free = False
             raise
 
diff --git a/PFERD/output_dir.py b/PFERD/output_dir.py
index 783d6bc..ee4910e 100644
--- a/PFERD/output_dir.py
+++ b/PFERD/output_dir.py
@@ -14,7 +14,7 @@ from typing import AsyncContextManager, BinaryIO, Iterator, Optional, Tuple
 from rich.markup import escape
 
 from .logging import log
-from .report import MarkConflictException, MarkDuplicateException, Report
+from .report import Report
 from .utils import ReusableAsyncContextManager, prompt_yes_no
 
 SUFFIX_CHARS = string.ascii_lowercase + string.digits
@@ -22,7 +22,7 @@ SUFFIX_LENGTH = 6
 TRIES = 5
 
 
-class OutputDirException(Exception):
+class OutputDirError(Exception):
     pass
 
 
@@ -146,25 +146,15 @@ class OutputDirectory:
     def register_reserved(self, path: PurePath) -> None:
         self._report.mark_reserved(path)
 
-    def _mark(self, path: PurePath) -> None:
-        """
-        May throw an OutputDirException
-        """
-
-        try:
-            self._report.mark(path)
-        except MarkDuplicateException:
-            raise OutputDirException("Another file has already been placed here.")
-        except MarkConflictException as e:
-            raise OutputDirException(f"Collides with other file: {e.collides_with}")
-
     def resolve(self, path: PurePath) -> Path:
         """
-        May throw an OutputDirException.
+        May throw an OutputDirError.
         """
 
         if ".." in path.parts:
-            raise OutputDirException(f"Path {path} contains forbidden '..'")
+            raise OutputDirError(f"Forbidden segment '..' in path {path}")
+        if "." in path.parts:
+            raise OutputDirError(f"Forbidden segment '.' in path {path}")
         return self._root / path
 
     def _should_download(
@@ -297,7 +287,7 @@ class OutputDirectory:
             local_path: Path,
     ) -> Tuple[Path, BinaryIO]:
         """
-        May raise an OutputDirException.
+        May raise an OutputDirError.
         """
 
         # Create tmp file
@@ -309,7 +299,7 @@ class OutputDirectory:
             except FileExistsError:
                 pass  # Try again
 
-        raise OutputDirException(f"Failed to create temporary file {tmp_path}")
+        raise OutputDirError("Failed to create temporary file")
 
     async def download(
             self,
@@ -319,7 +309,8 @@ class OutputDirectory:
             on_conflict: Optional[OnConflict] = None,
     ) -> Optional[AsyncContextManager[FileSink]]:
         """
-        May throw an OutputDirException.
+        May throw an OutputDirError, a MarkDuplicateError or a
+        MarkConflictError.
         """
 
         heuristics = Heuristics(mtime)
@@ -327,7 +318,7 @@ class OutputDirectory:
         on_conflict = self._on_conflict if on_conflict is None else on_conflict
         local_path = self.resolve(path)
 
-        self._mark(path)
+        self._report.mark(path)
 
         if not self._should_download(local_path, heuristics, redownload):
             return None
diff --git a/PFERD/report.py b/PFERD/report.py
index 1c46216..7d8aa85 100644
--- a/PFERD/report.py
+++ b/PFERD/report.py
@@ -1,19 +1,18 @@
-from dataclasses import dataclass
 from pathlib import PurePath
 from typing import Set
 
 
-@dataclass
-class MarkDuplicateException(Exception):
+class MarkDuplicateError(Exception):
     """
     Tried to mark a file that was already marked.
     """
 
-    path: PurePath
+    def __init__(self, path: PurePath):
+        super().__init__(f"A previous file already used path {path}")
+        self.path = path
 
 
-@dataclass
-class MarkConflictException(Exception):
+class MarkConflictError(Exception):
     """
     Marking the path would have caused a conflict.
 
@@ -24,8 +23,10 @@ class MarkConflictException(Exception):
     usually not possible.
     """
 
-    path: PurePath
-    collides_with: PurePath
+    def __init__(self, path: PurePath, collides_with: PurePath):
+        super().__init__(f"File at {path} collides with previous file at {collides_with}")
+        self.path = path
+        self.collides_with = collides_with
 
 
 # TODO Use PurePath.is_relative_to when updating to 3.9
@@ -58,16 +59,16 @@ class Report:
         """
         Mark a previously unknown file as known.
 
-        May throw a MarkDuplicateException or a MarkConflictException. For more
-        detail, see the respective exception's docstring.
+        May throw a MarkDuplicateError or a MarkConflictError. For more detail,
+        see the respective exception's docstring.
         """
 
         for other in self.marked:
             if path == other:
-                raise MarkDuplicateException(path)
+                raise MarkDuplicateError(path)
 
             if is_relative_to(path, other) or is_relative_to(other, path):
-                raise MarkConflictException(path, other)
+                raise MarkConflictError(path, other)
 
         self.known_files.add(path)