Invalid Signature error !

Question

I am trying to update my application , but after uploading the binary , Itunes connect sends me this email :

Dear Developer, Thank you for your recent

Answer 1

Note that this QA is incredibly old. Apple have largely ameliorated this problem. Enjoy.

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99 times out of 100, here is the problem:

Select "TARGETS", not "PROJECT"

Click on the name of your project at the Top Left of the main XCode6 window. (ie, just above where it probably says "Classes".)

Look at the large area which opens. Carefully look at the WHITE COLUMN ONTHE LEFT.

Choose "TARGETS" ... rather than "PROJECT"

Then, correctly set your certificate to the 3rd party Mac Developer cert.