PHP error when the plugin is activated

Product Enquiry for WooCommerce create 2 errors when it is activated.

error 1:
A PHP session was created by a session_start () function call. This interferes with the REST API and loopback requests. The session should be closed with session_write_close () before making any HTTP request.

error 2:
The REST API is one way for WordPress or other applications to communicate with the server. One example is the editor’s screen, which relies on it to view and save your posts.

The REST API request failed with an error.
Error: cURL error 28: Operation timed out after 10000 milliseconds with 0 bytes received (http_request_failed)

Could resolved this problem.
Best regard Yvon