Android : Consultation regarding a mysterious message on Eclipse

The project worked fine for sudden I start getting the following message on Eclipse

layout cannot be resolved or is not a field

on this line: setContentView(R.layout.activity_comm);

and this: imageCodeProject.setImageResource(R.drawable.info);

i try this:

1. close & open Eclipse again


2. delete the R.java (and the Eclipse create a new one)


3. restart the computer


4. Project --> Clean


5. right click on my project --> Android Tools --> Fix Project Properties

but nothing help