There are syntax errors In your SMYCP_player_court_button.gui file on your button tabs.

The correct syntax for the button_tab type is
type <name> = button_tab {

But you have
type <name> = button_tab = {

So for example your
type SMYCP_court_button = button_tab = {

Should be
type SMYCP_court_button = button_tab {

You have the same syntax error on all three button tabs in the file.