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    Step 3 is wrong. Eigen is not part of your project, it's a third party library. The way to handle third party libraries is to install them where they want to be installed and then tell your project where you installed them, not copy them into your project. Commented Oct 11, 2024 at 5:05
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    What version of C++ are you compiling for? Please also show the code you are compiling. Also don't show screen shots of code, include all code as text in the question. Commented Oct 11, 2024 at 5:38
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    Just noticed that you are using VS2010. That is very old, that's probably the issue here. Time to upgrade. Commented Oct 11, 2024 at 5:39
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    VS2010 ??? Wow, why not upgrade so you can use vcpkg instead? Commented Oct 11, 2024 at 5:45
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    You will most likely have to install an old version of this library. You can't use a modern version with a 14+ year old compiler. Also remember that before VS 2015 the msvc compiler was incompatible across major versions. You likely can't use compiled binaries from any compiler other compiler version. Commented Oct 11, 2024 at 12:35