unable to run demo.py file - runtime error

[Trivenu]

got the below error while running:
on3.8 -I/home/karthik/.local/lib/python3.8/site-packages/pybind11/include
[i 0524 10:49:50.172849 52 compiler.py:898] extension_suffix: .cpython-38-x86_64-linux-gnu.so
[i 0524 10:49:50.427291 52 init.py:168] Total mem: 10.62GB, using 3 procs for compiling.
[i 0524 10:49:50.993130 52 jit_compiler.cc:20] Load cc_path: /usr/bin/g++
[i 0524 10:49:51.052464 52 init.py:249] Found mpicc(4.0.3) at /usr/bin/mpicc.
[i 0524 10:49:51.124027 52 compiler.py:653] handle pyjt_include/home/karthik/.local/lib/python3.8/site-packages/jittor/extern/mpi/inc/mpi_warper.h
Traceback (most recent call last):
File "demo.py", line 4, in
from WindowUI import WindowUI
File "/home/karthik/Documents/deeplearning/DeepFaceDrawing-Jittor/WindowUI.py", line 18, in
jt.flags.use_cuda = 1
RuntimeError: Wrong inputs arguments, Please refer to examples(help(jt.flags)).

Types of your inputs are:
self = flags,
arg = int,

The function declarations are:
void _set_use_cuda(int v)
void _set_use_cuda(bool v)

Failed reason:[f 0524 10:49:51.790183 52 cuda_flags.cc:30] Check failed: value==0 No CUDA found.

[tsv19su254052]