Issue increasing memory on Guest VM on Hyper-V 2012 R2 The error code was '0x70' ('There is not enough space on the disk.').

Hello,

I'm having an issue increasing the memory on a guest sql VM. I am running Hyper-V 2012 R2 and trying to increase the guest from 12 gigs to 32 gigs or 64 gigs?

The Hyper-V server has 256 memory and has 60 gigs of hard-drive space available (total of 120).

 The guest-VM has 12 gigs of ram installed and 20 gigs of hard-drive space available (ISCSI-EMC storage attached-clustering shared  volume for OS total of 50 gigs but only using 30 gigs).  Why would it complain about the disk space? Is it complaining about disk space on the Guest or Hyper-V hypvisor? 

Error below:

Cluster resource 'Virtual Machine SQL-PROD1' of type 'Virtual Machine' in clustered role 'SQL-PROD1' failed. The error code was '0x70' ('There is not enough space on the disk.').

Based on the failure policies for the resource and role, the cluster service may try to bring the resource online on this node or move the group to another node of the cluster and then restart it.  Check the resource and group state using Failover Cluster Manager or the Get-ClusterResource Windows PowerShell cmdlet.