Walkthrough Using the newest version of RapidRig:
Open maya
Change working units to ‘meters’ in preferences
Open rapid rig modular
Create new proxy rig with bipedal template
Error in console and progress bar stuck at “Generating Modules - Loading Transforms 0%”
Note: we updated from Maya 2023 to 2025
Loading proxy Rig from: /Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_templates_data/1_biped.rrm3stp
Building "Leg" leg proxy module
# Traceback (most recent call last):
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_functions/proxy_rig_gen_prompt.py", line 148, in generate_proxy_rig
# proxies_save_load_setup.load_proxy_setup_file(file_name, [prefix_l, prefix_r])
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_functions/proxies_fit/proxies_save_load_setup.py", line 290, in load_proxy_setup_file
# load_proxy_setup_from_data(proxy_data, file_prefixes)
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_functions/proxies_fit/proxies_save_load_setup.py", line 306, in load_proxy_setup_from_data
# create_modules(prefixes, proxy_data['Module Parameters'], status_bar=progress_modules_control)
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_functions/proxies_fit/proxies_save_load_setup.py", line 224, in create_modules
# leg.create_module()
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_gen/proxy_modules/proxy_module.py", line 112, in create_module
# self.create_main()
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_gen/proxy_modules/proxy_leg.py", line 135, in create_main
# self.proxy_limb_start).create()
# ^^^^^^^^
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_gen/proxy_create_nodes.py", line 675, in create
# ProxyLocator(proxy_node=start_lctr, proxy_module=f'RRM_{self.mod_name}').create()
# File "/Users/Shared/Autodesk/ApplicationAddins/rrm3/Contents/scripts/proxies/proxy_gen/proxy_create_nodes.py", line 788, in create
# self.size *= 0.01
# ^^^^^^^^^
# AttributeError: 'ProxyLocator' object has no attribute 'size'

Thanks for reporting this, I will add a fix in the next update.