Migration did not succeed. Not enough disk space at '\'. Windows Server 2012 R2

Hi.
I get the error referenced here:
https://support.microsoft.com/en-us/kb/2913461but the os is Windows Server 2012 R2 (not Windows Server 2012).

The machine is one of the two Windows Server 2012 R2 hyper-v failover clustering nodes using CSV on iscsi storage.
The vm machine was created locally in hyper-v and is using 2 vhdx (one for os the other for data) on local disk.
To make vm highly available i configure role in Failover Cluster Manager and it is ok then i move storage on CSV (os vdisk on one CSV data disk on the other) with move > Virtual Machine Storage and i get two errors (in event viewer):

Hyper-V-VMMS Event id 20820

Storage migration for virtual machine 'machinename' (21330etc...) failed with error 'There is not enough space on the disk.' (0x80070070).

Hyper-V-VMMS Event id 20750

Migration did not succeed. Not enough disk space at '\'.

I've already done the same thing for other vm's without any problem and there is a lot of space in CSVs.

So, is the fix valid for windows server 2012 R2 also?

Thank you