Android : facebook android sdk application id error

I have added the application id string and put that to my manifesto file, even after that also i am getting applicationid error

Here is a trace from logcat

09-06 05:11:49.214: E/AndroidRuntime(1600): FATAL EXCEPTION: main
09-06 05:11:49.214: E/AndroidRuntime(1600): Process: com.mydomain.myapp, PID: 1600
09-06 05:11:49.214: E/AndroidRuntime(1600): java.lang.RuntimeException: Unable to start 
03274activity ComponentInfo{com.mydomain.myapp/mydomain.myapp.FbShare}:
java.lang.NullPointerException: Argument 'applicationId' cannot be null

Also is there anything else i have to do before using facebook share dialog?

Check: (I had followed )

a) Adding FaceBook SDK Library

b) Created App on Facebok Developer, (with hash key etc )

c) Declaring use permissions for internet, adding application id in strings.xml and manifesto file.

Please help Thanks