I see you're using 1.32.1 which is an old version.
In the FnF download page we should have version 1.32.3 / 1.32.4 (latest from 1.32) already uploaded - I recommend using it instead.
1. Which PowerCLI version are you using (5.5/5.8/6.0 - 32/64 bit)? Are you running it as administrator?
2. On Which OS is your VC installed?
3. Did the ScaleIO plugin folder downloaded to the VC location (see paths below)?
4. Are there "old" scaleio plugins in the same plugin folder?
I also recommend doing this clean-up procedure before attempting the registration again.
How to clean-up your Env and perform clean install (while using previously defined networks):
~ # esxcli system module parameters set -m scini -p ""
~ # esxcli software vib remove -n scaleio-sdc-esx5.5 / 6.0
15. If needed: Reboot all ESXs that SDC was removed from
**Paths per VC version and OS **
Virgo logs: C:\ProgramData\VMware\vSphere Web Client\serviceability\logs
Plugin logs and other files: C:\Windows\System32\config\systemprofile\AppData\Roaming\VMware\scaleio
Plugin location C:\ProgramData\VMware\vSphere Web Client\vc-packages\vsphere-client-serenity
Virgo logs: /var/log/vmware/vsphere-client/
Plugin logs and other files: /opt/.vmware/scaleio
Plugin location /var/lib/vmware/vsphere-client/vc-packages/vsphere-client-serenity/
Virgo logs: C:\ProgramData\VMWare\vCenterServer\logs\vsphere-client\logs
Plugin logs and other files: C:\Users\vspherewebclientsvc\AppData\Roaming\VMware\scaleio
Plugin location C:\ProgramData\VMware\vCenterServer\cfg\vsphere-client\vc-packages\vsphere-client-serenity
Virgo logs: /var/log/vmware/vsphere-client/logs
Plugin logs and other files: /etc/vmware/vsphere-client/vc-packages/scaleio
Plugin location: /etc/vmware/vsphere-client/vc-packages/vsphere-client-serenity