I have the following code for a freqency meter. When I compile the code I get the failure message concerning the last 3 lines of the code: Compilation error: 'lcd' does not name a type
You will not see errors from these two lines (above), but they will cause your project to fail.
The variables rs, en, and d4 through d7 were given values (pin numbers).
In the "object/instance creation" line, you should use those previously defined variable names.