Get an error excalmation mark every time I create a new android project
<p>I’m new to android development and haven’t made much progress. Whenever I create a new android application I get a red exclamation by its file in the package explorer. Also when I go to the open the string.xml file and try to edit anything there I keep getting an error message Java.Lang.NullPointerException.  I heard that using the clean feature in the projects tab may work, yes it gets rid of their exclamation but when I try to edit anything in strings.xml I still get the same error. 
Any help would be greatly appreciated   </p>
