Flux kustomization timeout

In fluxCD when I try to install gitops UI or try to deply block-buster using flux, I get this error:

flux get kustomization

NAME REVISION SUSPENDED READY MESSAGE
flux-system False False failed to download archive: GET http://source-controller.flux-system.svc.cluster.local./gitrepository/flux-system/flux-system/09e4d3dd.tar.gz giving up after 10 attempt(s): Get “http://source-controller.flux-system.svc.cluster.local./gitrepository/flux-system/flux-system/09e4d3dd.tar.gz”: dial tcp: lookup source-controller.flux-system.svc.cluster.local. on 10.43.0.10:53: read udp 10.42.0.11:34069->10.43.0.10:53: i/o timeout

seems that flux trying to clone git repository using ssh key but the ssh key does not exist.

I would appreciate your help.