C++ Compiler Error Help

I get this error with my program: 

/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake -DCMAKE_BUILD_TYPE=Debug -G "CodeBlocks - Unix Makefiles" "/Users/juliandolby/Desktop/School/Spring 2021/CSIS223/CSIS223Dolby,Julian/CircleClass"
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc - broken
CMake Error at /Applications/CLion.app/Contents/bin/cmake/mac/share/cmake-3.17/Modules/CMakeTestCCompiler.cmake:60 (message):
The C compiler

"/usr/bin/cc"

is not able to compile a simple test program.

It fails with the following output:

Change Dir: /Users/juliandolby/Desktop/School/Spring 2021/CSIS223/CSIS223Dolby,Julian/CircleClass/cmake-build-debug/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_82ce6/fast && xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:2 (project)

-- Configuring incomplete, errors occurred!
See also "/Users/juliandolby/Desktop/School/Spring 2021/CSIS223/CSIS223Dolby,Julian/CircleClass/cmake-build-debug/CMakeFiles/CMakeOutput.log".
See also "/Users/juliandolby/Desktop/School/Spring 2021/CSIS223/CSIS223Dolby,Julian/CircleClass/cmake-build-debug/CMakeFiles/CMakeError.log".

[Previous CMake output restored: 3/20/21, 07:28]

I have no idea how to solve it and other similar post have led me nowhere any help on this would be greatly appreciated.