Site Membership review list missing

I have made some changes to the FBA pack based on our requirements, however suddenly I am getting

Site Membership Review List missing error in MembershipRequest.cs, precisely at

SPList memberlist = web.Lists[MembershipList.MEMBERSHIPREVIEWLIST];

What am I missing?

And recently, we installed SP1 for Sharepoint 2010.

Thanks in advance

It looks like it can't find the Membership Review List.  Have you checked your site to see if the list exists? Redeploying the FBA Pack should recreate it.  If the list is there, it could potentially be a permissions issue.

Thanks for the reply, while deploying it gives a

Error 10 Error occurred in deployment step 'Activate Features': Feature with Id 'd57f4817-f1f1-42aa-863c-139804c731b0' is not installed in this farm, and cannot be added to this scope.

Membership review list is a part of the solution, I have not modified it, but is not getting deployed due to the above error

Sounds like an earlier step failed.  Try a manual deploy to figure out what's going on:

http://technet.microsoft.com/en-us/library/cc262995.aspx