Change Prefix of Sales Invoice Series - Server Error TypeError 'filter'

I just wanted to change the SI prefix of invoices in Setup-Naming Series.

I changed the Series List to:
RE-.YY.-.MM.-.###
RE-RET-.YY.-.MM.-.###

I get this error:
Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/app.py”, line 62, in application
response = frappe.handler.handle()
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 22, in handle
data = execute_cmd(cmd)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 55, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 942, in call
return fn(*args, **newargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 83, in runserverobj
frappe.desk.form.run_method.runserverobj(method, docs=docs, dt=dt, dn=dn, arg=arg, args=args)
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/run_method.py”, line 39, in runserverobj
r = doc.run_method(method, args)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 765, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1040, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1023, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 759, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/naming_series/naming_series.py”, line 55, in update_series
self.set_series_for(self.select_doc_for_series, series_list)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/naming_series/naming_series.py”, line 77, in set_series_for
default = options[0] if options else ‘’
TypeError: ‘filter’ object is not subscriptable

Could someone tell me what I’m doing wrong here?

Thank you!

Can you share the steps for setting the naming series?