Varying the number of keys make no difference. Admittedly, the 16 was amistake, however, just using 2 breaks as well with th exact same error.
You might need to send the database along. Could you try this test code? It is the same code that you had, except that it creates a new database and puts in some values. If this fails, then something is wrong with your version of metakit. Otherwise your database might be corrupt.
import metakit
import random, string
db=metakit.storage("foo.mk",1)
vw=db.getas("linelists[mid:S,field:S]";)
m=db.getas('map[_H:I,_R:I]')
vwh=vw.hash(m,2)# add data
for i in range(100):
vwh.append((random.choice(string.letters),
random.choice(string.letters)))
# end addrows=[]
for r in vwh: rows.append((r.mid,r.field))
db=None print rows
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