Xcode 8 can't archive “Command /usr/bin/codesign failed with exit code 1”

Question

I\'ve got a serious problem on Xcode 8 on macOS Sierra. when I try to build my app, I get the following issue.

CodeSign /Users/me/Library/Developer/Xcode/Der         


        

Answer 1

I want to show my answer because it may be of interest (I have wasted a lot of time with this error)

None of the previous answers (which have a high score) have been useful to me.

They may be correct, but they haven't solved my problem.

Origin:

I added a new Target to my iOS application: iMessage

When I added png images to the Assets. xcassets, the error occurred.

Solution:

Make a copy of png images with "Apple Preview App" and uncheck Alpha.

Error message disappears.