ESP32_SDcard_jpeg.ino returned the following error when compiling unused variable 'mcu_pixels' [-Werror=unused-variable]

[paulw517]

While working with this Arduino sketch ESP32_SDcard_jpeg.ino, it returned the following error message:

ESP32_SDcard_jpeg:211:14: error: unused variable 'mcu_pixels' [-Werror=unused-variable]
uint32_t mcu_pixels = win_w * win_h;
^~~~~~~~~~

I am working with Arduino: 1.8.12 (Windows 8.1), Board: "ESP32 Wrover Kit (all versions), 4MB (32Mb), Enabled, Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS), 240MHz (WiFi/BT), QIO, 80MHz, 921600, None, Disabled"

Elecrow 3.5in. ILI9488 TFT Display with onboard ESP32-WROVER-B micro and onboard SD Card reader

C:\Users\Paul\Documents\V2VWB\V2VWB 3.0\Sketches\ESP32_SDcard_jpeg\ESP32_SDcard_jpeg.ino: In function 'void jpegRender(int, int)':
ESP32_SDcard_jpeg:211:14: error: unused variable 'mcu_pixels' [-Werror=unused-variable]
uint32_t mcu_pixels = win_w * win_h;
^~~~~~~~~~
ESP32_SDcard_jpeg-ino sketch error unused variable mcu_pixels.docx