Can't launch Jupyter notebook from Anaconda Navigator

With Anaconda Navigator (macos 13.1) when I click the Launch button in the Jupyter Notebook pane (usage?) I cannot create a notebook. The Terminal output is

$ /opt/anaconda3/bin/jupyter_mac.command ; exit;
Traceback (most recent call last):
File “/opt/anaconda3/bin/jupyter-notebook”, line 7, in
from notebook.notebookapp import main
File “/opt/anaconda3/lib/python3.9/site-packages/notebook/”, line 79, in
from .services.contents.manager import ContentsManager
File “/opt/anaconda3/lib/python3.9/site-packages/notebook/services/contents/”, line 17, in
from nbformat import sign, validate as validate_nb, ValidationError
File “/opt/anaconda3/lib/python3.9/site-packages/nbformat/”, line 11, in
from . import v1, v2, v3, v4
File “/opt/anaconda3/lib/python3.9/site-packages/nbformat/v4/”, line 39, in
from .convert import downgrade, upgrade
File “/opt/anaconda3/lib/python3.9/site-packages/nbformat/v4/”, line 13, in
from … import validator
File “/opt/anaconda3/lib/python3.9/site-packages/nbformat/”, line 15, in
from .json_compat import ValidationError, _validator_for_name, get_current_validator
File “/opt/anaconda3/lib/python3.9/site-packages/nbformat/”, line 11, in
import jsonschema
File “/opt/anaconda3/lib/python3.9/site-packages/jsonschema/”, line 23, in
from jsonschema.validators import (
File “/opt/anaconda3/lib/python3.9/site-packages/jsonschema/”, line 422, in
File “/opt/anaconda3/lib/python3.9/site-packages/jsonschema/”, line 61, in load_schema
data = path.read_text(encoding=“utf-8”)
AttributeError: ‘PosixPath’ object has no attribute ‘read_text’

At one point the Launch button did work; I have no clue why it stopped working.