During the Oracle installation the error code TNS-04610 comes up in the Oracle GUI.
TNS-04610: NO LITERALS LEFT, REACHED END OF NV PAIR
This error is caused by a bad or missing TNSNAMES.ORA file.
Re-create the TNSNAMES.ORA file using Symantec Data Loss Prevention Oracle 11g Installation and Upgrade Guide or Symantec Data Loss Prevention Oracle 12c Enterprise Implementation Guide or scrub the one you are using for errors looking for syntax errors.
The other option is to cancel and start the installation over.