Frappe Builder Install Error

On latest version of Frappe (15.8.1) - Just tried to install Frappe Builder on an existing test site - getting the following error. Crashes site - unable to login, etc. I think after the install instructions on github bench --site sitename.localhost install-app builder command - a bench update --patch command may also be needed (?) - as the site seems to be missing the Builder Page doctype… Not an expert by any means - appreciate any guidance. Thanks.

Traceback (most recent call last):
  File "apps/frappe/frappe/website/", line 17, in get_response
    endpoint, renderer_instance = path_resolver.resolve()
  File "apps/frappe/frappe/website/", line 43, in resolve
    endpoint = frappe.get_attr(handler)(self.path)
  File "apps/builder/builder/builder/doctype/builder_page/", line 556, in resolve_path
    for d in get_web_pages_with_dynamic_routes()
  File "apps/frappe/frappe/utils/", line 157, in redis_cache_wrapper
    val = func(*args, **kwargs)
  File "apps/builder/builder/builder/doctype/builder_page/", line 542, in get_web_pages_with_dynamic_routes
    return frappe.get_all(
  File "apps/frappe/frappe/", line 1977, in get_all
    return get_list(doctype, *args, **kwargs)
  File "apps/frappe/frappe/", line 1952, in get_list
    return frappe.model.db_query.DatabaseQuery(doctype).execute(*args, **kwargs)
  File "apps/frappe/frappe/model/", line 197, in execute
    self.columns = self.get_table_columns()
  File "apps/frappe/frappe/model/", line 555, in get_table_columns
    return get_table_columns(self.doctype)
  File "apps/frappe/frappe/model/", line 73, in get_table_columns
    return frappe.db.get_table_columns(doctype)
  File "apps/frappe/frappe/database/", line 1122, in get_table_columns
    raise self.TableMissingError("DocType", doctype)
pymysql.err.ProgrammingError: ('DocType', 'Builder Page')

try bench --site sitename migrate

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