diff --git a/mayan/apps/documents/models.py b/mayan/apps/documents/models.py
index 2c2a5c6632..c0ea043b87 100644
--- a/mayan/apps/documents/models.py
+++ b/mayan/apps/documents/models.py
@@ -20,11 +20,10 @@ from django.utils.translation import ugettext
 from django.utils.translation import ugettext_lazy as _
 
 from converter.api import convert, get_page_count, get_available_transformations_choices
-from converter.exceptions import UnknownFileFormat, UnkownConvertError
+from converter.exceptions import UnknownFileFormat
 from converter.literals import (DEFAULT_ZOOM_LEVEL, DEFAULT_ROTATION,
     DEFAULT_PAGE_NUMBER)
-from mimetype.api import (get_mimetype, get_icon_file_path,
-    get_error_icon_file_path)
+from mimetype.api import get_mimetype
 
 from .conf.settings import (CHECKSUM_FUNCTION, UUID_FUNCTION,
     STORAGE_BACKEND, DISPLAY_SIZE, CACHE_PATH,
diff --git a/mayan/apps/documents/views.py b/mayan/apps/documents/views.py
index 6fdb61b9a0..b5169c8b11 100644
--- a/mayan/apps/documents/views.py
+++ b/mayan/apps/documents/views.py
@@ -24,7 +24,6 @@ from common.utils import (pretty_size, parse_range, urlquote,
     return_diff, encapsulate)
 from common.widgets import two_state_template
 from common.conf.settings import DEFAULT_PAPER_SIZE
-from converter.exceptions import UnknownFileFormat, UnkownConvertError
 from converter.literals import (DEFAULT_ZOOM_LEVEL, DEFAULT_ROTATION,
     DEFAULT_PAGE_NUMBER, DEFAULT_FILE_FORMAT_MIMETYPE)
 from converter.office_converter import OfficeConverter
@@ -34,7 +33,7 @@ from navigation.utils import resolve_to_name
 from permissions.models import Permission
 
 from .events import HISTORY_DOCUMENT_EDITED
-from .conf.settings import (DISPLAY_SIZE, PREVIEW_SIZE, STORAGE_BACKEND, ZOOM_PERCENT_STEP,
+from .conf.settings import (PREVIEW_SIZE, STORAGE_BACKEND, ZOOM_PERCENT_STEP,
     ZOOM_MAX_LEVEL, ZOOM_MIN_LEVEL, ROTATION_STEP, RECENT_COUNT)
 from .forms import (DocumentForm_edit, DocumentPropertiesForm,
         DocumentPreviewForm, DocumentPageForm,