Database Software

I'm attempting to move a lab database from Enterprise to Express.
I'm using datapump (expdp/impdp) on both ends of the migration.

However, on the import (impdbp), I'm getting a bunch of errors.

ORA-39083: Object type TABLESPACE failed to create with error:
ORA-01276: Cannot add file [path]. File has an Oracle Managed Files file name.

I'm using a very simplistic form of the commands. Too simple?

[enterprise]$ expdp \"/ as sysdba\" dumpfile=filename.dmp full=y
[express]$ impdp \"/ as sysdba\" dumpfile=filename.dmp

I'm searching around and haven't yet found a good article on how
to migrate data smoothly from Enterprise to Express. Maybe I have
not been using the right keywords and missing what I'm looking for.

Thanks!