Problem after updating manager server

Internal Error

20.7.60

my ip/businesses**

System.MissingMethodException: Method ‘Array.Empty’ not found. at Manager.ApplicationData.Get (System.String entityId) <0x40dfced0 + 0x000b7> in :0 at ManagerServer.HttpHandlers.HttpHandler.GetCurrentUser () <0x40dfc4d0 + 0x001e3> in :0 at ManagerServer.HttpHandlers.HttpHandler.ProcessRequest () <0x40dfa000 + 0x00b2f> in :0

You need .NET Framework 4.6.1 or higher. Go to https://dotnet.microsoft.com/download/dotnet-framework and install it first.

@its a linux server should i updae mono? which version is needed ?

Then install the latest version of Mono from https://www.go-mono.com

The latest version is apparently 6.8.0

it seems i have problems with mono install, i am in linux 16.04 and it seems i have broken packages that doesnt allow me to update, i am checking to fix this, thanks @lubos