Debug Assertion Failed! Expression: __acrt_first_block == header

Question

I am trying to test the dll which I wrote with GoogleTest and when I call one of the tests It throws me this error:

Answer 1

I was seeing this error too and in my case I had all the memory model settings lined up correctly. However having recently upgraded the projects from vs2013 to vs2015 I had stale references between the .exe and .dll, so in fact I was using the old DLL built with 2013. I had to remove the reference between the .exe and .dll and re-add it to update the name of the .lib that the exe was linking against. (Right click on the "References" child item of the .exe project and "Add", while confusingly also allows you to remove a reference).