msg.hbacommon.outofspace:There is no more space for virtual disk .vmdk. You may be able to continue this session by freeing disk space on the relevant partition, and clicking Retry. Otherwise, click Abort to terminate this session.
I haven't seen this message in awhile (knock-on-wood), but if this does occur, you will need to (1) add space to the datastore and (2) answer the message prompt. If this datastore housed a number of VMs, you could have your hands busy clicking VMs and answering message prompts.
Or you could use PowerCLI.
To target all VMs:
Get-VM | Get-VMQuestion | Answer-VMQuestion -DefaultOption
To target all VMs on a specific datastore:
Get-Datastore datastorename | Get-VM | Get-VMQuestion | Answer-VMQuestion -DefaultOption
To avoid being prompted to confirm the answer, you can add "-Confirm:$false" to each command.
More information on Answer-VMQuestion cmdlet (actually called Set-VMQuestion, but I prefer using its alias) located here: https://www.vmware.com/support/developer/windowstoolkit/wintk40u1/html/Set-VMQuestion.html