APP page not loaded from our nextcloud

Centos 7.0
Apache 2.4
PHP: 7.4
Nextcloud :20.0.7
Whenwant to install new app, I get nothin in left sid as categories.
At loggnig pages there are so many warning shown below:

GuzzleHttp\Exception\RequestException: cURL error 60: Peer’s certificate issuer has been marked as not trusted by the user. (see

60 is:

The remote server’s SSL certificate or SSH md5 fingerprint was deemed not OK. This error code has been unified with CURLE_SSL_CACERT since 7.62.0. Its previous value was 51.

Is it about ?