Sample error: Plugin not found.
If DEBUG mode is set to “true” following error message might also be visible:
file_get_contents(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086…
Explanation: None
Known to happen when: updating plugins.
Admin Panel accessibility: Accessible.
Possible Solution: Check which version of PHP is used on your server. If 5.6 version is used, downgrade it to 5.4. Try updating plugins once again after that.