Here is the log:

2015-02-06T09:56:30.100Z 92320 TID-oxbi4ru1w WARN: invalid date 2015-02-06T09:56:30.101Z 92320 TID-oxbi4ru1w WARN: /Users/karthik/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/exiftool-0.6.0/lib/exiftool/field_parser.rb:33:in civil'
/Users/karthik/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/exiftool-0.6.0/lib/exiftool/field_parser.rb:33:in civil_date'

And here's the code:

def filemeta(myfile)
return Exiftool.new(oldpath(myfile)).to_hash
end

I thought this was an EXIFtool error so I tried extracting the metadata using the exiftool system command, and it worked. I wonder where this issue is! Tried Googling for it, and nothing turned up.