"3.5inches 480_320 TFT LCD Capacitive Touchscreen" issue.

Hi,
I'm trying to use basicTest.ino from https://wiki.dfrobot.com/3.5inches_480_320_TFT_LCD_Capacitive_Touchscreen_SKU_DFR0669 on an Arduino Uno.

DFRobot_GDL 1.0.4 / DFRobot_LcdDisplay 2.0.0 are installed

When I select "Verify" "'screen' was not declared in this scope" error message is displayed.  Using Arduino IDE 1.8.19

Any help or suggestions appreciated.

I'm wanting to test the screen because overtime the area on the screen that responds to touch appears to be reducing towards one end.

Cheers,

David