I saw problem like this. Probably this bug in exp/imp parser.

sitation was following:

if in CREATE TABLE statment was line -->
abc date default SYSDATE ,
bcd ... )
or
usr varchar2(30) default user ,
aaa ... )
all was OK

but if was:

abc date default SYSDATE )
or
usr varchar2(30) default user )

export utility issued error ORA-01003 .
different was only ) or , has been wrote after .. DEFAULT + function name without ().

Check does any table has text like this.