Data Conversion

What would cause this? I am exporting data from schema S1 in database D1, and importing into schema S2 in database D2. In S1, everything is in the USERS tablespace. I set up the default tablespace in S2 to be TS2, grant unlimited quota on TS2 and no quota on USERS. S2 btw is starting out empty. Out of 100 tables, 96 of them correctly loaded into