diff --git a/client/ayon_core/lib/attribute_definitions.py b/client/ayon_core/lib/attribute_definitions.py
index 3dd284b8e4..0a9d38ab65 100644
--- a/client/ayon_core/lib/attribute_definitions.py
+++ b/client/ayon_core/lib/attribute_definitions.py
@@ -281,7 +281,7 @@ class HiddenDef(AbstractAttrDef):
     def __init__(self, key, default=None, **kwargs):
         kwargs["default"] = default
         kwargs["hidden"] = True
-        super(UnknownDef, self).__init__(key, **kwargs)
+        super(HiddenDef, self).__init__(key, **kwargs)
 
     def convert_value(self, value):
         return value
diff --git a/client/ayon_core/tools/launcher/ui/hierarchy_page.py b/client/ayon_core/tools/launcher/ui/hierarchy_page.py
index 226a57930b..ad48e8ac77 100644
--- a/client/ayon_core/tools/launcher/ui/hierarchy_page.py
+++ b/client/ayon_core/tools/launcher/ui/hierarchy_page.py
@@ -70,7 +70,7 @@ class HierarchyPage(QtWidgets.QWidget):
         main_layout.addWidget(content_body, 1)
 
         btn_back.clicked.connect(self._on_back_clicked)
-        refresh_btn.clicked.connect(self._on_refreh_clicked)
+        refresh_btn.clicked.connect(self._on_refresh_clicked)
         folders_filter_text.textChanged.connect(self._on_filter_text_changed)
 
         self._is_visible = False
@@ -99,7 +99,7 @@ class HierarchyPage(QtWidgets.QWidget):
     def _on_back_clicked(self):
         self._controller.set_selected_project(None)
 
-    def _on_refreh_clicked(self):
+    def _on_refresh_clicked(self):
         self._controller.refresh()
 
     def _on_filter_text_changed(self, text):