got it solved. --webadmin is no longer a usable term. it alone is what was the issue. after running ubboquity with the --help command i saw that it was now --remoteadmin. so after i  changed the arguments in my NSSM service to -jar c:\Ubooquity\Ubooquity.jar --remoteadmin --headless --workdir c:\Ubooquity it runs fine now

thank you

i tried this and it is not working for me at all.i have NSSM and my ubooquity is in c:\ubooquity and i have the path, startup directory, and arguments just like you have them it does not work.the service says its started but in the logs there is nologs entries showing it started. and the web pages "library/admin" are not reachable. i am on ubooquity version 2.1.1