ORA-16019: cannot use string with LOG_ARCHIVE_DEST

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ORA-16019: cannot usestring withLOG_ARCHIVE_DEST or LOG_ARCHIVE_
DUPLEX_DEST
Cause: Oneof the following events caused an incompatibility: 1) Parameter LOG_
ARCHIVE_DEST or LOG_ARCHIVE_DUPLEX_DEST was in use when the
specified LOG_ARCHIVE_DEST_n (n = 1...31) or DB_RECOVERY_FILE_DEST
parameter was encountered while fetching initialization parameters. 2)Parameter
LOG_ARCHIVE_DEST or LOG_ARCHIVE_DUPLEX_DEST was in use when an
attempt was made to use an ALTER SYSTEM or ALTER SESSION command to
define a value for the specified LOG_ARCHIVE_DEST_n or DB_RECOVERY_
FILE_DEST parameter. 3) An ALTER SYSTEM ARCHIVE LOG START TO
command was in effect when the specified LOG_ARCHIVE_DEST_n parameter
was encountered while fetching initialization parameters. 4) An ALTER SYSTEM
ARCHIVE LOG START TO command was in effect when an attempt was made to
use an ALTER SYSTEM or ALTER SESSION command to define a value for the
specified LOG_ARCHIVE_DEST_n parameter.
Action: Eliminateany incompatible parameter definitions.