I know this is a little late, but here goes anyway...
phil sohan wrote:and also 1 error is coming which says that
The declared package "com.strategic.mapping" does not match the expected package "src.com.strategic.mapping"
This error means that you have the wrong "source directory". My guess is that the project directory got marked as a source directory instead of the src directory. To fix this, right-click the project and unmark it as a source directory, then right-click on src and mark it as a source directory. I suspect this might also fix the other errors you got.