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iOS

Xcode.project Error: linker command failed with exit code 1 (use -v to see invocation) Why is this occurring?

Hi, I am new to programming and I recently created my first app. I have had this issue I believe happen once before and had someone look it over to see why the error occurred. I have provided screenshots of my error log and the error is stated as clang: error: linker command failed with exit code 1 (use -v to see invocation). Why is this occurring and what is the best approach to fixing the error or preventing it in the future from occurring? Note- I have deleted all derived data and in my build settings turned off bitcode. The issue still occurs. Additionally, in the error messages it states duplicate symbol_OBJC numerous times. I also have imported Firebase through terminal. I am guessing it's a linking issue when compiling?