An attempt was made to use a bind variable larger than 4000 bytes for a SQL statement when the client initially connected to a container with STANDARD MAX_STRING_SIZE, and then within the same session switched to a container with EXTENDED MAX_STRING_SIZE.
Restart the database in UPGRADE mode, modify the parameter, run the utl32k.sql script in $ORACLE_HOME/rdbms/admin, and restart the database in normal mode.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
http://docs.oracle.com/cd/E16655_01/appdev.121/e17625/oci10new.htm
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