Merge replication error "The snapshot for this publication has become obsolete" in SQL Server 2005

Hi Experts,

Need you're help to figure out this error we are facing for many of our publishers while viewing in replication monitor:

The snapshot for this publication has become obsolete. The snapshot agent needs to be run again before the subscription can be synchronized. (Source: MSSQL_REPL, Error number: MSSQL_REPL-2147198698)

Actually , the issue started as their respective replication jobs REPL-SNAPSHOT were failed. We ran the job after fixing and it was successful.

However we still see the above error in replication monitor:

Now how subscription can be synchronized once above snaphsot job has ran:

Note: We have the pull subscription enabled and web synchronization has been enabled in the publication properties and thus i  blve i am unable to see the option of view sync status from publisher?

Any help would be appreciated as i am completely new with this sort of replication?

Thanks