Unable to install eigen in clion

Question

I am new to programing and am using Clion to code. I have tried configuring the eigen library in C make but I am unable to do so.

My C make file is as follows :

cmake_minimum_required(VERSION 3.25)
project(Laser_ablation_nanoparticles)

set(CMAKE_CXX_STANDARD 23)

set(EIGEN_DIR "C:\Users\Vishal\Documents\Academic documents\MSc\Manchester\dissertation\Eigen\eigen-3.4.0\eigen-3.4.0\Eigen")
if(NOT EXISTS ${EIGEN_DIR})
    message(FATAL_ERROR "Please check that the set Eigen directory is valid!")
endif()

include_directories(${EIGEN_DIR})

add_executable(Laser_ablation_nanoparticles main.cpp)

My resposnse is :

"C:\Program Files\JetBrains\CLion 2023.1.5\bin\cmake\win\x64\bin\cmake.exe" -DCMAKE_BUILD_TYPE=Debug "-DCMAKE_MAKE_PROGRAM=C:/Program Files/JetBrains/CLion 2023.1.5/bin/ninja/win/x64/ninja.exe" -G Ninja -S C:\Users\Vishal\CLionProjects\Laser_ablation_nanoparticles -B C:\Users\Vishal\CLionProjects\Laser_ablation_nanoparticles\cmake-build-debug CMake Error at CMakeLists.txt:6 (set): Syntax error in cmake code at

C:/Users/Vishal/CLionProjects/Laser_ablation_nanoparticles/CMakeLists.txt:6

when parsing string

C:\Users\Vishal\Documents\Academic documents\MSc\Manchester\dissertation\Eigen\eigen-3.4.0\eigen-3.4.0\Eigen

Invalid character escape '\U'.

-- Configuring incomplete, errors occurred! See also "C:/Users/Vishal/CLionProjects/Laser_ablation_nanoparticles/cmake-build-debug/CMakeFiles/CMakeOutput.log".

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I have eigen dense at : C:\xxx\dissertation\Eigen\eigen-3.4.0\eigen-3.4.0\Eigen