I am unable to login using linkedin integration module drupal 7?
The LinkedIn Integration module won't automatically create a new user account for you. From step 5 of the directions in the module's README:


  Usage : Users will have to associate their LinkedIn account with their
  local Drupal account (at user/%user/edit/linkedin) to use any
  functionality provided by submodules.


So if you log in via LinkedIn with a LinkedIn account that isn't yet associated with a Drupal user account, you still need to create the new Drupal user account, and then the module will automatically associate the LinkedIn account with the new Drupal account in a submit handler that it attaches to the user register form.