Hey Man, did you get a reply on this question? Cause I'm experiencing also an error that why I'm asking. :) Cheers!
Failed to resolve packages: The file [B:\UNITY\PROJECTS\TEST\UNITY 2019 PSX TEST\Packages\manifest.json] is not valid JSON:
Unexpected string in JSON at position 1721 while parsing '{
"dependencies": {
"com.unity.col'. No packages loaded.
A re-import of the project may be required to fix the issue or a manual modification of B:/UNITY/PROJECTS/TEST/UNITY 2019 PSX TEST/Packages/manifest.json file.