Changing Runtime Library broke std::string. Why?

EDIT: I've fixed the problem by setting my Runtime Library to inherit from project default. I was using Multi-treaded DLL(/MT) because a SDL-2 tutorial I used did that.

Can someone explain why this broke the string's of c++?

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Whenever I try to use a string my compiler gives me the following errors:

LNK2019 unresolved external symbol __imp___invalid_parameter referenced in function "void * __cdecl std::_Allocate(unsigned int,unsigned int,bool)"

LNK2019 unresolved external symbol __imp___CrtDbgReportW referenced in function "void * __cdecl std::_Allocate(unsigned int,unsigned int,bool)"

I've stripped all my code to the bare minimum and it is as followed:

#include <string>

int main(int argc, char *argv[]) {
    std::string resPath;
    return 0;
}

I have no idea where to look. Does anyone have an idea?

I'm using MSVS Community 2015.