Error migrating from Postgres 6.3.2

I am migrating from postgres 6.3.2 to 7.1 Beta6. After performing a
pg_dumpall > backupfile on my old pgsql version I try to restore the data
with psql -d template1 -f backupfile, but I get "Unable to locate type name
'char16' in catalog" on tables such as onek, tenk1 ,tenk2....

What is the problem?
Shoul I replace this type with some other?

Thanks for your help in advance,

Luis,
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Luis Javier Martínez Martínez Instituto Tecnológico de Informática
Telf: 34 (9) 63 87 72 33 Universidad Politécnica de Valencia
Email: luimarma(at)iti(dot)upv(dot)es Camino de Vera s/n 46071 Valencia
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