right click on VM and go to edit settings take a screen shot(which shows how many disk are added)
high light each disks and you should be able to see on which datastore the respective VMDK is stored, this will help you in checking respective datastore available space.
Yes it can be with storage, but you need to check .
On this message : - Swap: 3683: Failed to create swap file '/vmfs/volumes/52d71515-0f264c58-2f2f-38eaa7abfa2e/web3/vmx-web3-2638557098-1.vswp' : Not found
Check if you see vswp file from datastore, if you dont find which means its not getting created.
If it is available but still throwing this message then it is some thing to do with lock/ access
regards
Gayathri