unable to open "C:\Users\username\.xmrig.json".
C:\qskg\xmrig-6.16.0-5t>xmrig.exe -a gr -o stratum+tcps://us-west.flockpool.com:5555 -u wallet.workername --tls --threads=5 --config=C:\qskg\xmrig-6.16.0-5t\config.json
[2021-11-27 17:33:40.755] unable to open "C:\Users\username\.xmrig.json".
[2021-11-27 17:33:40.756] unable to open "C:\Users\username\.config\xmrig.json".
[2021-11-27 17:33:40.756] no valid configuration found, try https://xmrig.com/wizard

What is xmrig.json at all? Please advise.