When exchanging 1C with Bitrix, a strange error occurs?

Question

1C-Bitrix

Writes the following error in the log:

<p><font class="errortext">settings.php - not found!</font></p>

There is .settings.php on the site, the rights are set correctly, the connection to the database is correct
. When unloading 3000+ products, about 500 are unloaded and this error occurs.
In what there can be a problem, who will prompt?