Some solutions on the Internet are: Command + K, and then restart the computer. Just run it again.

But it is invalid for me. My reason is that the system library import location of accounts. Framework (the part circled in red below) is wrong. So I deleted the library and re imported it to run normally.

How to delete and add: select targets – & gt; build phases–> Link binary with libraries, find the corresponding library (I’m here accounts. Framework), click minus sign to delete, and click plus sign to add.