Errors in Eclipse for no reason

Question

I'm building an Android app.

I worked today on my app, and suddenly I saw that all the projects in the workspace are marked with an error. I don't know what caused it, and I can't find explanation of the error anywhere.

I'm using Helios with Windows 7. I even tried downloading Eclipse again but it didn't help.

Today I tried to integrate Facebook with my app. Their tutorial required me to try to get a hesh key from a keystore. In the process I added an Environment Variable named JAVA_HOME, and pointed it to the JDK.

I don't know if it's the cause of my problem, but I think it might be related.

I really don't know what to do.

Thanks!

Answer 1

Try this. In eclipse, go to Project --> Clean --> Select "clean all projects". This should rebuild all projects.

Answer 2

Try cleaning your android project. I get problems with Eclipse sometime, and if I clean the project, it fixes it.