The command I run is :  There goes wrong .  I just get this exif info simply , Why there throwed an error? When I run `putStrLn $ show $ Meta.lookup Meta.Width metadata`, It shows correct info.
The command I run is :
There goes wrong .
I just get this exif info simply , Why there throwed an error?
When I run
putStrLn $ show $ Meta.lookup Meta.Width metadata, It shows correct info.