What is this error and should I be worried about it? (in bold below)

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ServUO - [https://www.servuo.com] Version 0.5, Build 6396.27340
Core: Optimizing for 8 64-bit processors
RandomImpl: CSPRandom (Software)
Core: Loading config...
Scripts: Compiling C# scripts...Finished with: 0 errors, 0 warnings
Scripts: Skipping VB.NET Scripts...done (use -vb to enable)
Scripts: Verifying...
Finished (6480 items, 1323 mobiles, 5 customs) (1.22 seconds)
Searching for Ultima Online installations...
Config: Warning, using default value for DataPath.CustomPath
Found 1 Ultima Online installations:
C:\Program Files (x86)\Electronic Arts\Ultima Online Classic
DataPath: C:\Program Files (x86)\Electronic Arts\Ultima Online Classic

**** VITA-NEX: CORE 4.0.0.0 **** Root Directory: Scripts\Customs\Vita-Nex Core 4.0.0.0\ Working Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\ Build Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Build\ Data Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Data\ Cache Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Cache\ Services Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Services\ Modules Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Modules\ Backup Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Backups\ Saves Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Saves\ Logs Directory: C:\Users\Ted Gress\Desktop\Fun Games\UO Stuff\druidsvn\Bug_Fixes\VitaNexCore\Logs\ http://core.vita-nex.com The MIT License (MIT) Copyright (c) 2016, Vita-Nex | http://core.vita-nex.com Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software", "Vita-Nex: Core", "VNc"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
[VitaNexCore]:
[VitaNexCore]: Compile action started...
[VitaNexCore]: Compiling Services...
[VitaNexCore]: Compiling Modules...
[VitaNexCore]: Compile action completed in 0.05 seconds
[VitaNexCore]:
[VitaNexCore]: Configure action started...
[VitaNexCore]: Configuring Services...
[VitaNexCore]: Configuring Modules...
[VitaNexCore]: Configure action completed in 1.26 seconds
Regions: Loading...done
World: Loading...
...done (172531 items, 2768 mobiles, 3 customs) (2.39 seconds)
23:10:34 Restricting client version to 7.0.55.4. Action to be taken: LenientKick
23:10:34 Joeku's Staff Runebook: Loading...
23:10:34 Account: ted_gress... done.
23:10:34 Book Publishing: Loading...
23:10:34 VitaNexCore]:
23:10:34 VitaNexCore]: Load action started...
23:10:34 VitaNexCore]: Loading Services...
23:10:34 VitaNexCore]: Loading Modules...
23:10:34 VitaNexCore]: Load action completed in 0.09 seconds
23:10:34 VitaNexCore]:
23:10:34 VitaNexCore]: Invoke action started...
23:10:34 VitaNexCore]: Invoking Services...
23:10:34 VitaNexCore]: Invoking Modules...
23:10:34 VitaNexCore]: Invoke action completed in 0.06 seconds
23:10:34 Listening: 50.73.21.101:2593
23:10:34 Listening: 169.254.106.38:2593
23:10:34 Listening: 169.254.140.110:2593
23:10:34 Listening: 127.0.0.1:2593
23:10:34 ----------------------------------------------------------------------
23:10:34 Web API]: An attempt was made to access a socket in a way forbidden by its access permissions
23:10:34 Web API]: Not listening. You must call the Start() method before calling this method.

23:11:34 Cleaning Empty Account Vaults.
23:11:34 0 empty account vaults cleaned up.
23:11:59 Client: 127.0.0.1: Connected. [1 Online]
23:11:59 Login: 127.0.0.1: Valid credentials for 'ted_gress'
23:12:00 Client: 127.0.0.1: Connected. [2 Online]
23:12:00 Login: 127.0.0.1: Account 'ted_gress' at character list
23:12:00 Enhanced Client Not Detected
23:12:00 Client: 127.0.0.1: Disconnected. [1 Online] [ted_gress]
23:12:12 Notice: DisplayGumpPacked creating new 36864 byte buffer
23:12:12 Notice: DisplayGumpPacked creating new 135168 byte buffer
23:12:23 Notice: DisplayGumpPacked creating new 69632 byte buffer
23:12:23 Notice: DisplayGumpPacked creating new 270336 byte buffer
23:12:24 Notice: DisplayGumpPacked creating new 69632 byte buffer
23:12:24 Notice: DisplayGumpPacked creating new 270336 byte buffer
23:12:26 Notice: DisplayGumpPacked creating new 135168 byte buffer
23:12:26 Notice: DisplayGumpPacked creating new 540672 byte buffer
23:12:42 Notice: DisplayGumpPacked creating new 135168 byte buffer
23:12:42 Notice: DisplayGumpPacked creating new 540672 byte buffer
 
You don't need to worry about that, the error seems scary, but what it's related to is that something else is listening on port 80 already and the WebAPI can not bind to that end-point in order to serve Http requests.

The WebAPI service is essential for the correct operation of some features, like AutoDonate and WebStats, but if you don't intend to use those features, you can ignore the error.

If you wish to allow the WebAPI to bind to port 80 to allow these features to work, you must find out what else is listening on port 80 and disable it before restarting your shard.

It is extremely likely that the process is Internet Information Services (on a windows-based host).
If you do not use IIS to serve any kind of website, you should uninstall it via the Add/Remove Windows Features menu.

If you do not wish to disable the service that you use on port 80, then you can change the port for the WebAPI in the service options via the [VNC control panel.
Note that changing the port will not affect the AutoDonate module, PayPal requires that IPN end-points be on port 80, so changing the port will not "fix" this feature.
 
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