Dnssec issues

Hello All, We are facing some resolution problems on a CENTOS resolver that deploys bind 9.11.36-S1 with DNSSEC being activated. The logs in 'default.logs' shows the current errors : X-Sep-2022 10:34:29.348 dnssec: info: validating shalltry.com/SOA: bad cache hit (shalltry.com/DS) X-Sep-2022

dig: couldn't get address for root servers

Greetings, Hope you're all doing great. Actually, I am using bind 9.11.28-S1, and I am facing some problems : whenever I use the command dig +trace, I came across this error : dig: couldn't get address for 'F.ROOT-SERVERS.NET': failure. Does anyone have an idea why I see this error ? It is