First ,thanks Marzia Niccolai for his email  .

Today ,my app get picklingerror. Lot's of those errors in admin
control panel .
“PicklingError: Can't pickle <type 'instancemethod'>: it's not found
as __builtin__.instancemethod”

This error throw  out when set a query object into memcache .

Do not use " Link.all().order('-weight')" to get all the data in Link
table , just use "Link.gql('ORDER BY weight desc').fetch(100)". it
will fix this error .

good luck .
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