RAD Studio (Common)
E2200: Package '%s' already contains unit '%s' (Delphi)

The package you are compiling requires (either through the requires clause or the package list) another package which already contains the unit specified in the message. 

It is an error to have to related packages contain the same unit. The solution to this problem is to remove the unit from one of the packages or to remove the relation between the two packages.

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