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s3cmd tool error: incomplete format

When I run

$ s3cmd

I get

    An unexpected error has occurred.
  Please report the following lines to:

Problem: ValueError: incomplete format
S3cmd:   1.0.1

Traceback (most recent call last):
  File "/usr/bin/s3cmd", line 2006, in <module>
  File "/usr/bin/s3cmd", line 1795, in main
    cfg = Config(options.config)
  File "/usr/lib/python2.7/site-packages/S3/Config.py", line 88, in __init__
  File "/usr/lib/python2.7/site-packages/S3/Config.py", line 105, in read_config_file
    cp = ConfigParser(configfile)
  File "/usr/lib/python2.7/site-packages/S3/Config.py", line 142, in __init__
    self.parse_file(file, sections)
  File "/usr/lib/python2.7/site-packages/S3/Config.py", line 170, in parse_file
    print_value = (data["value"][:2]+"...%d_chars..."+data["value"][-1:]) % (len(data["value"]) - 3)
ValueError: incomplete format

    An unexpected error has occurred.
    Please report the above lines to:

I found out where is the problem.

I was configuring s3cmd over

s3cmd --config

s3cmd had asked me to set up encrypted passphraze/password for GPG

$ s3cmd --configure
Encryption password is used to protect your files from reading
by unauthorized persons while in transfer to S3
Encryption password

I had set up really strong password including non A-Z chars (as

s3cmd --configure
didn't escape thos chars, therefore my configuration file was generated like this:

cat ~/.s3cfg
gpg_passphrase = examplepassword123%%

if anyone else have this kind of problem: to solve this remove s3cmd config file and run config again and set up password/passpraze with a-z A-Z 0-9 chars only

 rm ~/.s3cfg
 s3cmd --configure

date: 2013-05-23