actual fix

service.py

@@ -47,10 +47,8 @@ def on_receive_events(transaction):
             m_user, m_cont
             if global_msg_queue is not None:
                 global_msg_queue.add({
-                    "command",
-                    '/tellraw @a {"text":"<{}> {}","insertion":"/tellraw @p %s"}'.format(
-                        m_user, m_cont
-                    ),
+                    "command":
+                    '/tellraw @a {"text":"<' + m_user + '> ' + m_cont + '","insertion":"/tellraw @p %s"}',
                 })
             else:
                 LOG.warning("No message queue available")
@@ -214,6 +212,7 @@ def receive_messages(
 
 
 def main():
+    global global_msg_queue
     logging.basicConfig(level=logging.DEBUG)
     parser = argparse.ArgumentParser()
     parser.add_argument("--matrix_server_name", required=True)