After following the steps of integration, I am getting "Build input file cannot be found: '/Users/{path-to-project-derived-data}/Build/Products/Debug-iphoneos/json.o'. Did you forget to declare this file as an output of a script phase or custom build rule which produces it?"

[fattysun1121]

I followed the above steps to integrate nlohmann json to our project, did I miss anything?

[nlohmann]

The information you provided are insufficient to diagnose the issue. The screen shot looks like Xcode - what are you trying to build there?