Hi Rashmi,
I am guessing the problem and hence not specific. It seems the property file is missing in the project folder. Try this:
>create a new android project with little bit change in project name.[make sure you are giving same name which you gave during creation of original project,for new Activity.This is just to reduce naming errors:-) ]
>copy all the *.java files and *.xml files.(except R.java which is built in)
>Do necessary changes in manifest file.
>Be aware of the package name modifications.
Try now..
Good luck:-)