Why Delphi says 'cannot resolve unit name xxx'?

Question

I\'m working with Delphi2010 Enterprise Update 4.
When I\'m opening my project in the IDE and displaying the mainform code, there are 2 unit names underline in r

Answer 1

I reset the library path under tools\options\environment options\delphi options\library.

Click the dropdown box, and reselect your os, and it will reset the path to the library. Worked for me.