AssertionError: cannot start a process twice

First time running this locally - it’s a great tool, thanks for writing it! I’m using the latest version.

I encountered this issue on my first try:

$ python3 py-Classic-Resource-Finder.py --profile production
Checking the Classic platform status in us-east-1
Checking for EIPs in us-east-1
Checking for Classic EC2 Instances in us-east-1
Checking for Classic Security Groups in us-east-1
Checking for VPCs with ClassicLink enabled in us-east-1
Checking for AutoScaling Groups configured for Classic in us-east-1
Checking for Classic Load Balancers running in EC2-Classic in us-east-1
Checking for Classic RDS Instances in us-east-1
Checking for Classic ElastiCache clusters in us-east-1
Checking for Classic Redshift clusters in us-east-1
Checking for Classic Elastic BeanStalk Environments in us-east-1
Checking for Classic EMR clusters in us-east-1
Checking for Classic OpsWorks stacks in us-east-1
Checking for Classic Data Pipelines in us-east-1
Traceback (most recent call last):
  File "/Users/scott/src/external/ec2-classic-resource-finder/py-Classic-Resource-Finder.py", line 847, in <module>
    main(argparser(sys.argv[1:]))
  File "/Users/scott/src/external/ec2-classic-resource-finder/py-Classic-Resource-Finder.py", line 841, in main
    loopregions(classicregions, datapipelineregions, creddict)
  File "/Users/scott/src/external/ec2-classic-resource-finder/py-Classic-Resource-Finder.py", line 668, in loopregions
    process.start()
  File "/usr/local/Cellar/python@3.9/3.9.9/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/process.py", line 115, in start
    assert self._popen is None, 'cannot start a process twice'
AssertionError: cannot start a process twice

As you can see above, I’m running Python 3.9.9:

$ python3 --version
Python 3.9.9

I did get partial results from the single region and the errors file was empty after switching to my mfa profile.

Any hints?