Cumulus Support

Hi guys. I have been using CumulusMX on Win7 Pro for a year and a half with no issues. When it comes to PC's, I am a whiz...BUT, I am a newby at OS X. Just picked up a Mac Mini and have spent the past 3 days getting my station connected to the Mac. I got it connected tonight and now I am getting this error:

Last login: Thu Mar 16 18:07:35 on ttys000
DavesmimacsMini:~ davesminimac$ cd desktop/cumulusmx
DavesmimacsMini:cumulusmx davesminimac$ sudo mono CumulusMX.exe
Password:
Current culture: English (United States)
Serial: 561E9E91D4A9244DE0A12ADD61755C3F
Cumulus MX v.3.0.0 build 3043
Today.ini = data/today.ini
Last update=2017-03-16T18:09:39
Connected to station
6:09:43 PM Downloading Archive Data
[ERROR] FATAL UNHANDLED EXCEPTION: System.Net.Sockets.SocketException (0x80004005): Address already in use
at System.Net.Sockets.Socket.Bind (System.Net.EndPoint localEP) [0x0004c] in <f8255d9ef0594d18ae2c0d97286b9a80>:0
at System.Net.EndPointListener..ctor (System.Net.HttpListener listener, System.Net.IPAddress addr, System.Int32 port, System.Boolean secure) [0x0004a] in <f8255d9ef0594d18ae2c0d97286b9a80>:0
at System.Net.EndPointManager.GetEPListener (System.String host, System.Int32 port, System.Net.HttpListener listener, System.Boolean secure) [0x000be] in <f8255d9ef0594d18ae2c0d97286b9a80>:0
at System.Net.EndPointManager.AddPrefixInternal (System.String p, System.Net.HttpListener listener) [0x00064] in <f8255d9ef0594d18ae2c0d97286b9a80>:0
at System.Net.EndPointManager.AddListener (System.Net.HttpListener listener) [0x00030] in <f8255d9ef0594d18ae2c0d97286b9a80>:0
DavesmimacsMini:cumulusmx davesminimac$

I know there are some OS X wizzes out there that probably know what is causing these errors. Can anyone shed any light and possibly a solution?

Thanks in advance.

[ERROR] FATAL UNHANDLED EXCEPTION: System.Net.Sockets.SocketException (0x80004005): Address already in use

That is usually caused by Cumulus MX being loaded twice i.e. the socket is already in use by the Cumulus MX already running.

Thank you David for your reply. My station connected this afternoon when I got home. I thought about it this afternoon at work and while driving home, I realized last night that I had never done a complete power down on the Mini Mac last night, just a few reboots. I powered it down for about 1 minute and then rebooted the Mac. I typed in my terminal script and it came up and connected without error this time. I opened Safari and type in the local host command and it actually worked. Now I have to see if it is reporting to all my sites I send info to. Hope I don't have to repeat this learning process again!