I see from another support thread with local not starting and this from a Linux environment that they are getting the same errors :[main] undefined: JSON parsing failed
https://community.localwp.com/t/localwp-wont-open-after-upgrading-to-new-localwp-update/37862
Yet I ran setup for 7.1.2 on my laptop which uses windows 11 pro 64bit and it worked with no errors.