Plugin problem

I have written a plugin called html_select_date2, and it is giving me 
some trouble.  The first time the page loads, the function is called and 
everything works smashingly.  However, if I refresh the page, I get this:
*
Fatal error*: Call to undefined function: 
smarty_function_html_select_date2() in 
*/public_html/php/templates_c/%%24^24D^24D5865F%%default.form.tpl.php* 
on line *97

*Is this a permissions problem, or is something else going on here?

-Erich-