#UBUNTU G++

When I run this command: g++ -std=c++17 -Wall -Icatch.hpp CalcList.cpp PP1Test.cpp

I got this warning: cc1plus: warning: catch.hpp: not a directory.

I put all my files in the same folder, I updated the latest G++, updated Ubuntu. I dont know what happen. I Googled and I saw someone said that I need to put a dot after -I, so I changed my command to: g++ -std=c++17 -Wall -I .catch.hpp CalcList.cpp PP1Test.cpp then nothing happend (not show up anything), I mean it supposed to say success or failed or error, but it does not say anything and lets me to type other command. Please help, THANKS!