PowerShell module for the F5 LTM REST API

Hi I am trying to automate simple process to create a simjple TCP load balancing session. I can log in etc using the script but when I try and use the new pool I am getting a value of false returned from the device.....

PS C:\Users\brian.twomey> New-Pool -Name /commom/TEST-Pool -Description Test -LoadBalancingMode least-connections-member False

Have tried with pool members listed PS C:\Users\brian.twomey> New-Pool -Name /commom/TEST-Pool -Description Test -LoadBalancingMode least-connections-member False

Set-Pool -Name TEST-Pool -Partition /common -LoadBalancingMode least-connections(member) -MemberDefinitionList {10.78.49.11,7998},{10.78.49.12,7998} False

I am a newbieto powershell so can someone tell me what the issue is here....