ORA-29273: HTTP request failed ORA-29024: Certificate validation failure ORA-06512: at "SYS.UTL_HTTP"

I got

ORA-29273: HTTP request failedORA-29024: Certificate validation failureORA-06512: at "SYS.UTL_HTTP"

while trying to get web page from site using https.I imported certificate from site into wallet

Oracle PKI Tool Release 19.0.0.0.0 - ProductionVersion 19.3.0.0.0Copyright (c) 2004, 2019, Oracle and/or its affiliates. All rights reserved.Requested Certificates:Subject:        C=UA,ST=ua,L=kyiv,O=test,OU=test,CN=testUser Certificates:Trusted Certificates:Subject:        CN=extremstyle.ua

Then run this block

declare req utl_http.req; resp utl_http.resp;begin utl_http.set_wallet('file:C:\OracleSoftware\admin\db1\dpdump', '*******');  -- here real password req := utl_http.begin_request('https://extremstyle.ua/'); utl_http.set_header(req, 'User-Agent', 'Mozilla/4.0'); resp := utl_http.get_response(req); utl_http.end_response(resp);end;/

What should I do or check also?I've read a lot of topics about this here, but still haven't got any idea ...