[MissingSetupFile] File [themes\SalesTheme\leftnav.gif] is referenced  times in the database [wss_sales_01], but is not installed on the current farm. Please install any feature/solution which contains this file. One or more setup files are referenced in the database [wss_sales_01], but are not installed on the current farm. Please install any feature or solution which contains these files.
This does not makes sense because I went to the 14 hive (template\themes\salestheme) and sure enough the leftnav.gif exists.
What is my next step? (I tried Bing search but bing told me to go Google, Google not giving me any good answer on this).
Please suggest what should I do next.