System not working and nothing shown on the lcd

[Dream-build]

Dear good sir, I managed to rebuild your circuit and successfully downloaded the code to TIVA, but the lcd has shown nothing. The lcd I used is the same to yours using HD44780. Is there anything I can do about it? And what could be wrong?
A lot of thanks.

Build output:
Load "D:\Document\year 4\3662 embedded system\mini project\C-Calculator-for-LCD-Keypad-master\elecprokect\Objects\projectelec.axf"
Connecting: Mode=JTAG, Speed=1000000Hz
Erase Done.
Programming Done.
Verify OK.
Flash Load finished at 18:11:39