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S.1932 is the senate verson of the deficit reduction bill & passed in the senate. The house was notified that senate has passed a bill S.1932. House need to do some action on it. This has happed before house passed the parallal bill HR 4241. After passing the HR4241 (which is different in terms of contents of the S.1932), the house removed all the text of S.1932 and replaced with the text of HR4241, and passed the bill S.1932 in the house. Therefore, the contents of s.1932 that was passed in the senate is different than the contents of s.1932 passed in the house. That is why now we have the conference.

In simple terms,

Senate passed one bill S.1932 (with imm. relief)
House passed two bills HR 4241 and S.1932 (both are identical text - same text of HR4241)