NoMethodError (undefined method `unpack' for #<Hash:0x007fe19298fb18>)

[laptite]

(Rails 3.2.18)
Scenario: I'm using the latest version of thoughtbot/paperclip (v4.1.1) to upload images and video. I use paperclip-meta to perform certain operations on images based on the metadata (image size).

Problem: I can't upload any video when using paperclip-meta v.1.1.0 b/c error message: NoMethodError (undefined method `unpack' for #Hash:0x007fe19298fb18). This is not a problem with paperclip-meta v.1.0.1.

Thanks for your help with resolving this matter :)