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1258151-push-notifications/lessons/9

Am taking 1258151-push-notifications/lessons/9.

Have followed all the directions according to the instructions but I could not make it work at (RUN > My Mac) which shows about 7:55 min into the lesson.

Here is the error message I got :
/Users/admin/Library/Developer/Xcode/DerivedData/Server-fzhcwwjkhxjvqpebwzoiovmzxwtv/SourcePackages/checkouts/crypto/Sources/CCryptoOpenSSL/include/c_crypto_openssl.h:4:10: ‘openssl/conf.h’ file not found

Yes, I did search internet for solution including this site but no avail for 4 days now.

I am running Mac OS 10.15.6 with Xcode 11.6 and am using iPhone 8(iOS 13.6.1).
If anyone out there who knows the cause of the error or the solution please help!

Thank you.