I am a beginner in using DPDK. I followed the guide below:

https://doc.dpdk.org/guides/linux_gsg/index.html

When I was running the sample hello world program, I received the following outputs:
Arguments : ./dpdk-helloworld -l 0-3 -n 4

EAL: Detected CPU lcores: 32
EAL: Detected NUMA nodes: 1
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: No free 1048576 kB hugepages reported on node 0
EAL: VFIO support initialized
EAL: Using IOMMU type 1 (Type 1)
EAL: pci_map_resource(): cannot map resource(32, 0x2180800000, 0x800000, 0x0): Cannot allocate memory ((nil))
EAL: Failed to map pci BAR0
EAL: 0000:07:00.0 mapping BAR0 failed: Cannot allocate memory
EAL: Requested device 0000:07:00.0 cannot be used
EAL: Using IOMMU type 1 (Type 1)
EAL: pci_map_resource(): cannot map resource(32, 0x2181000000, 0x800000, 0x0): Cannot allocate memory ((nil))
EAL: Failed to map pci BAR0
EAL: 0000:07:00.1 mapping BAR0 failed: Cannot allocate memory
EAL: Requested device 0000:07:00.1 cannot be used
TELEMETRY: No legacy callbacks, legacy socket not created
hello from core 1
hello from core 2
hello from core 3
hello from core 0

1. Why is pci_map_resource unable to allocate memory? Evn though, I have set up the huge pages and IOMMU according to the guide?
2. Why does it say “No free 1048576 kB hugepages reported on node 0” even though I have setup the huge pages?

AnonHugePages:   2586624 kB
ShmemHugePages:        0 kB
FileHugePages:         0 kB
HugePages_Total:    1024
HugePages_Free:     1024
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:         4194304 kB

Thanks for help in advance!!