You should install .Net 2.0.
See this page: www.basic4ppc.com/netcf2.html
You could find the compiled version of the SQLExample on the downloads page (named SQLCompiled).
Are you trying to run a compiled application?
If yes, then you should put in the same folder of your application the Basic4ppc.exe.config and rename it to YourApplicationName.exe.config (change YourApplicationName).
It is an example of which files should be copied when compiling a SQL application.
I downloaded and installed .Net framework 2.0 as in the instruction. Things went smooth except when I on desktop open the SQL.sbp, the attached error prompts.