ORA-16018: cannot use string with LOG_ARCHIVE_DEST

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ORA-16018: cannot usestring withLOG_ARCHIVE_DEST_n or DB_RECOVERY_
FILE_DEST
Cause: One of the following events caused an incompatibility:1) Parameter LOG_
ARCHIVE_DEST or LOG_ARCHIVE_DUPLEX_DEST was in use when a LOG_
ARCHIVE_DEST_n (n = 1...31) parameter was encountered while fetching
initialization parameters. 2) An ALTER SYSTEM ARCHIVE LOG START TO
command was in effect when a LOG_ARCHIVE_DEST_n parameter was
encountered while fetching initialization parameters. 3) A LOG_ARCHIVE_DEST_
n parameter was in use when an ALTER SYSTEM command was used to define a
value for either the LOG_ARCHIVE_DEST or LOG_ARCHIVE_DUPLEX_DEST
parameter. 4) Parameter DB_RECOVERY_FILE_DEST was in use when an attempt
was made to use an ALTER SYSTEM or ALTER SESSION command to define a
value for LOG_ARCHIVE_DEST or LOG_ARCHIVE_DUPLEX_DEST.
Action: Eliminateany incompatible parameter definitions.