EXP-00008: ORACLE error 1455 encountered

C:\Users\MaryHu>exp ARCER/ARCER@DB234 FILE=E:\FGPS_20130528.dmp statistics=none

Export: Release 11.2.0.1.0 - Production on Tue May 28 08:04:54 2013

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.


Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in AL32UTF8 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 ARCER
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user ARCER
About to export ARCER's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
. about to export ARCER's tables via Conventional Path ...
. . exporting table      COILS_ASSETS_DEPRECIATION         55 rows exported
. . exporting table              COILS_CODE_ASSESS         38 rows exported
. . exporting table          COILS_COMPANY_LICENSE         16 rows exported
. . exporting table                      COILS_EMP          8 rows exported
. . exporting table               COILS_LOG_ASSESS         14 rows exported
. . exporting table                   COILS_STORES         37 rows exported
. . exporting table           COMPANY_ANNOUNCEMENT          3 rows exported
. . exporting table                   CRM_CUSTOMER         51 rows exported
EXP-00008: ORACLE error 1455 encountered
ORA-01455: converting column overflows integer datatype
EXP-00000: Export terminated unsuccessfully