diff --git a/src/calibre/gui2/convert/xpath_wizard.py b/src/calibre/gui2/convert/xpath_wizard.py
index f15e234070..1c21982dde 100644
--- a/src/calibre/gui2/convert/xpath_wizard.py
+++ b/src/calibre/gui2/convert/xpath_wizard.py
@@ -60,7 +60,7 @@ class Wizard(QDialog):
 
         self.buttonBox.accepted.connect(self.accept)
         self.buttonBox.rejected.connect(self.reject)
-        self.setModal(Qt.WindowModality.WindowModal)
+        self.setWindowModality(Qt.WindowModality.WindowModal)
 
     @property
     def xpath(self):
diff --git a/src/calibre/gui2/device.py b/src/calibre/gui2/device.py
index 5b2ddbc9da..9a6434678c 100644
--- a/src/calibre/gui2/device.py
+++ b/src/calibre/gui2/device.py
@@ -931,7 +931,7 @@ class DeviceMixin:  # {{{
     def init_device_mixin(self):
         self.device_error_dialog = error_dialog(self, _('Error'),
                 _('Error communicating with device'), ' ')
-        self.device_error_dialog.setModal(Qt.WindowModality.NonModal)
+        self.device_error_dialog.setModal(False)
         self.device_manager = DeviceManager(FunctionDispatcher(self.device_detected),
                 self.job_manager, Dispatcher(self.status_bar.show_message),
                 Dispatcher(self.show_open_feedback),
diff --git a/src/calibre/gui2/main.py b/src/calibre/gui2/main.py
index 06756a6617..367ca93feb 100644
--- a/src/calibre/gui2/main.py
+++ b/src/calibre/gui2/main.py
@@ -278,6 +278,7 @@ class GuiRunner(QObject):
                 default_dir=initial_dir)
 
     def show_error(self, title, msg, det_msg=''):
+        print(det_msg, file=sys.stderr)
         self.hide_splash_screen()
         with self.app:
             error_dialog(self.splash_screen, title, msg, det_msg=det_msg, show=True)