This is probably something simple but I can't seem to figure it out. Here is the code and the runtime error.
Code:
////////////////////////////////////////////////////////////////////
#include <acknex.h>
#include <default.c>

////////////////////////////////////////////////////////////////////

function main()
{
  screen_size.x = 800;
  screen_size.y = 600;
	screen_color.blue = 150;
	mouse_mode = 4;
}

function quit_program()
{
	while (key_any) {wait (1);}
	sys_exit(NULL);
}

//////////////////////////////////////////////////////////////////////

PANEL* main_pan =
{
	bmap = "main.pcx";
 	pos_x = 250;     
 	pos_y = 200;    
	button (250, 134, "quitclicked.pcx", "quitnormal.pcx", "quitover.pcx", quit_program, NULL, NULL); 
	button (150, 94, "buttonclicked.pcx", "buttonnormal.pcx", "buttonover.pcx", NULL, NULL, NULL);
	flags = OVERLAY | SHOW;
}

Runtime Error: Can't open buttonclicked.pcx

I made 3 basic buttons in gimp and saved them as ZSoft PCX images, leaving them in the same directory as the other buttons.
Any help is appreciated.