i have a problem when i try to export ...
Connected to: Oracle Database 11g Express Edition Release 220.127.116.11.0 - 64bit Production
Export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user SEMESU
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user SEMESU
About to export SEMESU's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
EXP-00056: ORACLE error 12704 encountered
ORA-12704: character set mismatch
EXP-00000: Export terminated unsuccessfully
anyone? (i'll apreciatte)