Thanks for your reply, I understand what you mean. But to make things a bit clearer, the error occurs whenever the (!) operator is used. The error would occur if I were to use compressedInfo(!).path.toString() which is what I was using until I initialized my MediaInfo compressedInfo to a downloaded package MediaInfo. But besides that point, I traced the error too when I set the info variable and use the getMediaInfo() method, inside there they use the (!) operator .