Sql Server replication: Initial snapshot for publication is not yet available? I had setup transactional replication and my distributor, publisher are on same windows server and 2 subscriber one on same server and another on other windows server both using push snapshot.

I am getting the message in the synchronization status, that snapshot is not yet available, just a few hours back it was working fine every transaction was synchronized. The only thing i did in between was, added more articles(stored procedures, etc.) to the publication using its properties. 

Is it causing the issue here, there is no error message displayed. Just that I am not able to get the data replicated
Once you add articles to a transaction replication that is synced from snapshot(@sync_type = 'automatic'), you need to run the snapshot agent to generate the snapshot for the added article.  Note, depending on the immediate_sync parameter, it will create snapshot of either the entire publication(1) or just the article that you have added(0).