Pre-synthesis Failed without any error info

[lygooi3]

Hi,
Looking for help on "Pre-Synthesis Failed".
hls4ml reported the failure, but no further details on what failed.
Tried two models:

1. https://github.com/fastmachinelearning/hls4ml-tutorial/blob/main/part1_getting_started.ipynb
2. Modify (1) to make custom model.

(1) Successfully synthesized.
(2) Failed to synthesize.

The modification made in (2) are:

• Change to MNIST Dataset
• Added Conv2D & Flatten
• Apply 'sparse_categorical_crossentropy'

Attached the py script
part1_getting_started.txt
rework_part1.txt

Attached the vitis_log
part1_getting_started-vitis_hls.log
rework_part1-vitis_hls.log