key chain warning The “System Roots” keychain cannot be modified [closed]

Just try below three steps

Step 1: Open your Keychain Access app.
Step 2: You will see list in left side as 'Login' ,'System' and 'System Roots', just drag your certificate in 'Login' option.
Step 3: You will get certificate install successfully in Keychain Access.

Step 1 - download your developer certificate and drop in into your DEFAULT keychain

step 2 - download apple WWDRCA certificate and drop into the same keychain.

step 3 - CHECK if there is a private key along with your certificate. (you should be able to see tiny triangle beside your certificate. Click on it to see if your private key is present or not)

step 4 - download the provisioning profile from the developer portal and drop into your xcode.

Try to do these things first. If you still get a error, then delete the extra apple certificates in your keychain and try the process once again.. it will do the trick...

I had the same issue when I tried to install an iOS push service certificate with the Keychain Access application opened, to solve this problem, I just closed the application, and double click the certificate, then the certificate was installed without any problem.

I also faced this problem with the APNS certificate by double click on it getting the error but manually import certificate works for me.