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Save and categorize content based on your preferences.
Tell users exactly what went wrong. Be specific—vague error messages
The specified directory exists but is not writable. To add files to this
directory, the directory must be writable. [Explanation of how to make this
Invalid field 'picture'.
The 'picture' field can only appear once on the command line; this command
line contains the 'picture' field <N> times.
Note: Prior to version 2.1, you could specify the 'picture' field more than
once, but more recent versions no longer support this.