'csharp-mode.el' file won't byte-compile in Emacs

Following instructions on how to byte-compile a Lisp file in Emacs I used the "M-x byte-compile-file RET :[name of file]" to byte-compile the following .el file:

Well it won't let me link to the file because apparently I haven't made 15 posts yet but anyway here is the error code.


Here is the error message:
Leaving directory `~/'

Compiling file /home/jon/csharp-mode.el at Wed Jul 25 19:31:45 2012
Entering directory `/home/jon/'
csharp-mode.el:2028:1:Error: Symbol's value as variable is void: csharp-enum-decl-re



Here is the line of code to which it is referring:
(defconst csharp-font-lock-keywords-2 (c-lang-const c-matchers-2 csharp)
"Fast normal highlighting for C# mode.")

Sounds like you either haven't declared the variable "csharp-enum-decl-re" or you haven't assigned a value to it.