CRASH when building for web

So I have been working on this project for some time now and mainly been publishing to IOS, but for testing purposes I need to be able to publish to Web as well. I attempted to do this for the first time in a while since starting the project and it gets hung up on the "Postprocessing compressed web stream." point then it puts out this white box (what I assume is a error report). If I hit the enter key I will be asked to submit the error, but it also gets hung up in that process. My only option is to Force Quit.

I am using Unity free version.