[Fixed] Site doesn't work anymore since an hour

Bug Reports
#1

This error keeps coming up whenever I try to call a function on the server (anvil.server.call):

AnvilWrappedError: Portable classes must be new-style classes (inherit from object). <class anvil.email.Envelope at 0x7f6a3ab7d8a0> is not a new-style class.
at anvil_downlink_worker/init.py, line 176

I didn’t change anything in the code an hour ago. Update to Anvil?

#2

The problem has been fixed.