package R does not exist

I'm getting the dreaded package R does not exist, it's killing me. The code is fine I have apps in the market running the code.

Now it's effecting simple webview applications. o.0

R.string.app_name is error'd my main.xml and string.xml is fine. I'm sooo confused.

I re opened an older version to "borrow" some code and it was flooded with R. errors. I did a clean and nothing changed except for import R.android being added at the top.

I even loaded into Netbeans and I get the same thing. Clean is not working. Can I write the R.java file myself?

What is this R thing? isn't R. supposed to correspond to R.java