iperf 3.7 error: Resource temporarily unavailable

I am facing an issue while binding a port looks to be the issue. I am using ueransim and trying to benchmark the bandwidth using iperf3. I am continuously getting below error :
{
"start": {
"connected": [],
"version": "iperf 3.7",
"system_info": "Linux 29a1e56b8b73 5.15.0-1051-aws https://github.com/esnet/iperf/issues/56~20.04.1-Ubuntu SMP Tue Nov 28 15:43:31 UTC 2023 x86_64"
},
"intervals": [],
"end": {
},
"error": "error - unable to connect to server: Resource temporarily unavailable"
}