I would expect to see an error with "snapshot" in error text if you on the Equallogic added the one of the volumes for a server to an existing replication schedule and tested failover before creating a new replica - or on vmware storage migrated a protected volume away.
This way the srm will allow you to protect based on there is a replicated volume that corresponds to your configuration.
The test will fail due to when mounting the replicated volume there is no snapshot of the configured vmware guest.
If this is the cause of your problems then check your protected guests on protection site and verify where the files for your added hard disks are located.
Verify that replication is working for the Equallogic volumes that are the counterpart for those volumes.
If you migrated away, then unprotect and re-protect to update configuration.
I hope this will point you in the right direction
Regards
Tobias