diff --git a/src/error.rs b/src/error.rs
index c3a94f03..1404c034 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,17 +1,13 @@
 use gtk::{glib, subclass::prelude::*};
 
-use matrix_sdk::Error as MatrixError;
-
 type WidgetBuilderFn = Box<dyn Fn(&super::Error) -> Option<gtk::Widget> + 'static>;
 
 mod imp {
     use super::*;
-    use once_cell::sync::OnceCell;
     use std::cell::RefCell;
 
     #[derive(Default)]
     pub struct Error {
-        pub matrix_error: OnceCell<MatrixError>,
         pub widget_builder: RefCell<Option<WidgetBuilderFn>>,
     }
 
@@ -31,23 +27,12 @@ glib::wrapper! {
 }
 
 impl Error {
-    pub fn new<F: Fn(&Self) -> Option<gtk::Widget> + 'static>(error: MatrixError, f: F) -> Self {
+    pub fn new<F: Fn(&Self) -> Option<gtk::Widget> + 'static>(f: F) -> Self {
         let obj: Self = glib::Object::new(&[]).expect("Failed to create Error");
-        obj.set_matrix_error(error);
         obj.set_widget_builder(f);
         obj
     }
 
-    fn set_matrix_error(&self, error: MatrixError) {
-        let priv_ = imp::Error::from_instance(self);
-        priv_.matrix_error.set(error).unwrap()
-    }
-
-    pub fn matrix_error(&self) -> &MatrixError {
-        let priv_ = imp::Error::from_instance(self);
-        priv_.matrix_error.get().unwrap()
-    }
-
     /// Set a function that builds the widget used to display this error in the UI
     pub fn set_widget_builder<F: Fn(&Self) -> Option<gtk::Widget> + 'static>(&self, f: F) {
         let priv_ = imp::Error::from_instance(self);
diff --git a/src/session/room/mod.rs b/src/session/room/mod.rs
index a5fb480b..175f42eb 100644
--- a/src/session/room/mod.rs
+++ b/src/session/room/mod.rs
@@ -414,7 +414,6 @@ impl Room {
                         Err(error) => {
                                 error!("Couldn’t set the room category: {}", error);
                                 let error = Error::new(
-                                        error,
                                         clone!(@weak obj => @default-return None, move |_| {
                                                 let error_message = gettext!(
                                                     "Failed to move <widget> from {} to {}.",
@@ -889,16 +888,13 @@ impl Room {
                 Ok(result) => Ok(result),
                 Err(error) => {
                     error!("Accepting invitation failed: {}", error);
-                    let error = Error::new(
-                        error,
-                        clone!(@strong self as room => move |_| {
-                                let error_message = gettext("Failed to accept invitation for <widget>. Try again later.");
-                                let room_pill = Pill::new();
-                                room_pill.set_room(Some(room.clone()));
-                                let error_label = LabelWithWidgets::new(&error_message, vec![room_pill]);
-                                Some(error_label.upcast())
-                        }),
-                    );
+                    let error = Error::new(clone!(@strong self as room => move |_| {
+                            let error_message = gettext("Failed to accept invitation for <widget>. Try again later.");
+                            let room_pill = Pill::new();
+                            room_pill.set_room(Some(room.clone()));
+                            let error_label = LabelWithWidgets::new(&error_message, vec![room_pill]);
+                            Some(error_label.upcast())
+                    }));
 
                     if let Some(window) = self.session().parent_window() {
                         window.append_error(&error);
@@ -923,16 +919,13 @@ impl Room {
                 Ok(result) => Ok(result),
                 Err(error) => {
                     error!("Rejecting invitation failed: {}", error);
-                    let error = Error::new(
-                        error,
-                        clone!(@strong self as room => move |_| {
-                                let error_message = gettext("Failed to reject invitation for <widget>. Try again later.");
-                                let room_pill = Pill::new();
-                                room_pill.set_room(Some(room.clone()));
-                                let error_label = LabelWithWidgets::new(&error_message, vec![room_pill]);
-                                Some(error_label.upcast())
-                        }),
-                    );
+                    let error = Error::new(clone!(@strong self as room => move |_| {
+                            let error_message = gettext("Failed to reject invitation for <widget>. Try again later.");
+                            let room_pill = Pill::new();
+                            room_pill.set_room(Some(room.clone()));
+                            let error_label = LabelWithWidgets::new(&error_message, vec![room_pill]);
+                            Some(error_label.upcast())
+                    }));
 
                     if let Some(window) = self.session().parent_window() {
                         window.append_error(&error);
diff --git a/src/session/room_list.rs b/src/session/room_list.rs
index e67fd247..ae860808 100644
--- a/src/session/room_list.rs
+++ b/src/session/room_list.rs
@@ -329,7 +329,6 @@ impl RoomList {
                         obj.pending_rooms_remove(&identifier);
                         error!("Joining room {} failed: {}", identifier, error);
                         let error = Error::new(
-                            matrix_sdk::Error::Http(error),
                             clone!(@strong obj => move |_| {
                                     let error_message = gettext!(
                                         "Failed to join room {}. Try again later.", identifier