The app needs a list of codes to function correctly in src/main/resources/codes.txt.
To generate one, use this command: python src/vote_code_generator.py > src/main/resources/codes.txt
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For development, there is a sample file with easy to remember codes in src/main/resources/codes.txt.sample. Simply rename that file.
Prior to AppEngine 1.9.30, the local cloud storage needs system admin permissions to write to the disk.