Hello:
With Cornerstone try insert a cache row in wp_postmeta table in Wordpress shows this error
Error Duplicate entry ‘0’ for key ‘PRIMARY’ on WordPress databe for INSERT INTO pc_postmeta
(post_id
, meta_key
, meta_value
)…
Cornerstone failed to insert for Autoincrement ID and then, for any reason, delete the private key and insert with ID 0.
Can you help me to solve this issue?