I have the same 2 errors on a fresh 5.11.9.1010452 installation. I’m looking forward for a solution as well.
Edit: I found a solution here: JsonMappingException while getting control mode from URAdmin scipt - #2 by kaha
Basically, you have to copy the ursim’s /usr/bin content in the root /usr/bin folder. It worked for me and hopefully it will work for you