山海经

Marshal Data too short error with Rails

I’m getting this never before seen error quite a bit all of a sudden:

/!\ FAILSAFE /!\  Tue Jan 12 20:28:40 -0800 2010
  Status: 500 Internal Server Error
  marshal data too short

what helped in my case was to set the type of the ‘data’ column in the ’sessions’ table to ‘longtext’ (or ‘mediumtext’) instead of ‘text’：

class ChangeSessions2 < ActiveRecord::Migration
 def self.up
    execute "ALTER TABLE sessions CHANGE COLUMN data data LONGTEXT"
 end
 def self.down
 end
end

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