No idea what went wrong, but, we can try and figure it out. Perhaps it needs a less common tool or something nonstandard at run time, and it isn’t easy to find out what this is.
Can you tell me what command you used to create the partition, and the command you’re attempting to use to resize it? Together with those, perhaps we can reproduce this and see what, under the hood of gparted, and ideally parted itself, is going wrong or is missing.