unable to apply patch

[Harvinder Singh]

HI, When we try to apply patch 9.0.1.2.0 on 9.0.1.1.1 oracle we got error: There are no patches that need to be applied from patch set Oracle9i Patch set 9.0.1.2.0. Earlier we are able to apply the same patch on other machine. What might be the possible reason for this error????? Thanks --Harvinder