Did you take a look at **READ ME FIRST** Troubleshooting connection/loading project issues with Package Manager ?
Also, taking a look at the report, it says at the end:
Could not find UPM executable at path '/Applications/Unity/Hub/Editor/2020.1.0b7/Unity.app/Contents/Resources/PackageManager/Server/UnityPackageManager'
Can you check this path exists on your machine?
Regards,
Manuh73