oracle import problem

Hi all,
I'm having a problem with the import of object types. I receive the
following error message: 
IMP-00017: following statement failed with ORACLE error 2304:
 "CREATE TYPE "O_ASSIGNMENTS" TIMESTAMP '2003-01-07:13:31:25' OID 'B593D0A4E0"
 "6A4258B8859336B0387058'  "
 "AS OBJECT"
 "--"
 "-- MODIFICATION HISTORY"
 "-- Person      Date         Comments"
 "-- Wyns        29/08/2002   "
 "-- ---------   ----------   ------------------------------------------"
 "--"
 "--"
 ""
 "("
 "       "
 "   as_pk            number(8),"
 "   pat_pk           number(8),"
 "   rp_pk            number(8),"
 "   se_pk            number(8),"
 "   as_localdt       date,"
 "   as_gmtdt         date,"
 "   kit_pk           number(8),"
 "   ast_pk           number(8),"
 "   as_reassignment  number(1),"
 "   as_isused        number(1),"
 "   "
 "  MEMBER PROCEDURE ins"
 "    AS LANGUAGE JAVA"
 "    NAME 'com.lcc.dbobject.J_Assignment.insert()',"
 "  MEMBER PROCEDURE upd "
 "    AS LANGUAGE JAVA"
 "    NAME 'com.lcc.dbobject.J_Assignment.update()',"
 "  MEMBER PROCEDURE del"
 "    AS LANGUAGE JAVA"
 "    NAME 'com.lcc.dbobject.J_Assignment.delete()'"
 ""
 ");"
IMP-00003: ORACLE error 2304 encountered
ORA-02304: invalid object identifier literal

Does anybody has an idea how I can solve this?
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