I face the same issue too,I solve it by this:

First, I reCreate my team develop certificate(Because we renewed our root certificate)

2、 edit the Iphone Apps develop certificate ,be sure include your certificate you just create.

3、doing same to the watchkit extention And watchkit App

4、go to Your Xocde"Preference ", double click your "Team Name",delete the old Certificate of Iphone 、watchApps、 watchExtention

5、download your new certifcate and install.
Then it works.