Fail to save to picture

Saving to picture does not complete. The dialog box opens, we select the folder and the filename, but when we click on the 'save' button, the file is not created. In the shell, we see the following error:

$ ./pyacmegraph.py --ip 10.1.5.86 --load /home/ptitiano/dev/arm/iot-benchmarking/workload_materials/aws-greengrass/n50/yocto-n50-grengrass.acme Reading /home/ptitiano/dev/arm/iot-benchmarking/workload_materials/aws-greengrass/n50/yocto-n50-grengrass.acme file... Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway. Traceback (most recent call last): File "/home/ptitiano/dev/acme/pyacmegraph/./pyacmegraph.py", line 882, in change diag.setDefaultSuffix("png") AttributeError: 'tuple' object has no attribute 'setDefaultSuffix' Traceback (most recent call last): File "/home/ptitiano/dev/acme/pyacmegraph/./pyacmegraph.py", line 882, in change diag.setDefaultSuffix("png") AttributeError: 'tuple' object has no attribute 'setDefaultSuffix' Traceback (most recent call last): File "/home/ptitiano/dev/acme/pyacmegraph/./pyacmegraph.py", line 882, in change diag.setDefaultSuffix("png") AttributeError: 'tuple' object has no attribute 'setDefaultSuffix'

Observed on ubuntu 22.04.