Generally speaking, all views inside the same layout file should have different ids. A good practice would even be specifying different ids for all elements across all layout files.
Ids are used to uniquely specify each element in your layout. Two elements with the same ID is always a bad idea.
In eclipse, delete the whole "id" attribute, then rewrite it. When you start writing the content of the quotation marks, write the word "id", then hit ctrl+space, then enter. a "@+id/" text should appear, then you can type the new ID and other IDs shouldn't change