CLion error

Hi,

can somebody help me? :)

/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake -DCMAKE_BUILD_TYPE=Debug -G "CodeBlocks - Unix Makefiles" /Users/davson/Desktop/untitled

-- The C 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-3.12/Modules/CMakeTestCCompiler.cmake:52 (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/davson/Desktop/untitled/cmake-build-debug/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_ac855/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/davson/Desktop/untitled/cmake-build-debug/CMakeFiles/CMakeOutput.log".
See also "/Users/davson/Desktop/untitled/cmake-build-debug/CMakeFiles/CMakeError.log".

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