For a paper that I have to write for school, I have the following sentence* that my teacher claims is incorrect. I am not sure what is incorrect about it, but it has something to do with my usage of anyone and their.
Because of how the program works, anyone interested in using it only needs to have it installed on their machine.
What's wrong with my anyone - their usage?
*The sentence provided has been deliberately modified to make the subject of my paper ambiguous.