iostream file not found after installing plugins

I am using MacOS and after I have installed some plugins, (Indent rainbow, bracket rainbow, atom material icon and material theme UI), the IDE come weird. When I open a new project, the compiler gets an error:

/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_COMPILER=/Library/Developer/CommandLineTools/usr/bin/g++ -G "CodeBlocks - Unix Makefiles" /Users/sunnytam/CLionProjects/Lab3
-- 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/sunnytam/CLionProjects/Lab3/cmake-build-debug/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_cb0fd/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)

CMake Error at CMakeLists.txt:2 (project):
The CMAKE_CXX_COMPILER:

/Library/Developer/CommandLineTools/usr/bin/g++

is not a full path to an existing compiler tool.

Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.

-- Configuring incomplete, errors occurred!
See also "/Users/sunnytam/CLionProjects/Lab3/cmake-build-debug/CMakeFiles/CMakeOutput.log".
See also "/Users/sunnytam/CLionProjects/Lab3/cmake-build-debug/CMakeFiles/CMakeError.log".

[Previous CMake output restored: 25/2/2021, 13:15]

And as I open my older project, the basic file are gone, like 'iostream' file not found error were given

Can anyone tell me what is going on?