Can compile and run in Standalone, but can't run in Web Player

So, I've been working on this project for a bit now, doing all my compiles in standalone, and everything works PERFECTLY. I can run and debug in Unity, I can compile a test in the standalone, no hitches, anywhere.

Now, I go to Build & Run, and I want to test out the Web Player, to see how large it is. If it's too big for web, I will just keep it standalone, but I still want to test.

Well, now I have an issue. Every time I try to build I get this error: Loading script assembly "Library/ScriptAssemblies/Assembly-UnityScript.dll" failed!

Anyone know why this is?

Thanks in advance!