Swap partition not mounting on VM: Webmin keeps crashing on email server

SYSTEM INFORMATION
OS type and version CentOS Linux 7.9.2009
Webmin version 1.991
Cloudmin version 9.6 Pro

Error: Failed to save mount : The device file ‘/dev/vdb1’ does not exist

Disk and Network Filesystems > Virtual Memory > In use : No
Mount now > Mount > Save : Failed to save mount : The device file ‘/dev/vdb1’ does not exist

Swap memory shows zero in ‘free -m’ ; Webmin service keeps crashing on VM

Real Memory on VM: 10 GB

What is the output of:

$ fdisk -l

For some reason it picked up /dev/vdb1 instead of /dev/vdb (which exists), so I changed it and it took the partition. Thanks

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