Please do not use screenshots they are difficult to read and you can't copy information from them making things harder for people trying to help you. Instead of that paste the error messages here directly as formatted code, here is how to do it:
About your issue, you are trying to install that package from source which means it is going to need compiling but you don't have the gfortran compiler installed in your system, follow the official CRAN instructions about libraries needed to compile packages on macOS systems.