WebGui no longer operational

I was reading the many posts for the WebGui no functioning properly and could not locate one that resolved my NAS condition. A few days ago I lost the WebGui but retain access to the server on the network, PLEX and Mumble are operational still.
The error I receive from the attempted WebGui is:

Error #3008:
exception 'OMVException' with message 'Failed to load configuration (Fatal error 4: Document is empty (line=1, column=1); Fatal error 4: Start tag expected, '<' not found (line=1, column=1))' in /usr/share/php/openmediavault/config.inc:577
Stack trace:
#0 /usr/share/php/openmediavault/env.inc(22): require_once()
#1 /var/www/openmediavault/index.php(23): require_once('/usr/share/php/...')
#2 {main}

So I log into the the CLI and perform omv-firstaid, in an attempt to change the WebGui port back to 8080. I had to change the port once I started using PLEX, once that plugin was started I got the following from port 80.
It works!
This is the default web page for this server.

The web server software is running but no content has been added, yet.
Changing it to 8080 worked and had worked for 2 months, till this week.

Now when I click OK on changing port I get the following errors:

/etc/openmediavault/config.xml:1.1: Start tag expected, '<' not found

^
/usr/sbin/omv-firstaid: 262: [: -gt: unexpected operator
Updating web administration settings. Please wait ...
{"response":null,"error":{"code":7001,"message":"Failed to connect to socket: No such file or directory","trace":"exception 'OMVException' with message 'Failed to connect to socket: No such file or directory' in \/usr\/share\/php\/openmedia vault\/rpc.inc:135\nStack trace:\n#0 \/usr\/sbin\/omv-rpc(107): OMVRpc::exec('We bGui', 'setSettings', Array, Array, 2)\n#1 {main}"}}
Failed to execute RPC (service=WebGui, method=setSettings)

This has me lost, as if I needed help in that area.

I am running OMV 2.1 with a thumb drive as boot drive, 5-1TB raid 5 array HD's, 8Gb RAM AMD 3.6Ghz FM2 CPU, MSI A78M-E35 v2 Motherboard.

The newest plugin was Murmer which was installed approximately a month prior to the concern.

total 76
drwxr-xr-x 2 openmediavault openmediavault 4096 Apr 6 04:42 .
drwxrwxr-x 94 root root 4096 Apr 28 04:09 ..
-rw------- 1 openmediavault openmediavault 0 May 6 04:53 config.xml
-rw-r--r-- 1 openmediavault openmediavault 67028 Mar 14 2014 php.ini

Odd, I guess it just did not like the month of May. I ran the line you posted and got the lovely messages of:

Linux NAS 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u2 x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Fri May 6 12:52:17 2016 from desktop-725rbjc.local
root@NAS:~# apt-get install --reinstall openmediavault
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
openmediavault
1 upgraded, 0 newly installed, 0 to remove and 55 not upgraded.
Need to get 0 B/806 kB of archives.
After this operation, 1,024 B of additional disk space will be used.
(Reading database ... 35215 files and directories currently installed.)
Preparing to replace openmediavault 2.2.1 (using .../openmediavault_2.2.3_all.deb) ...
Unpacking replacement openmediavault ...
Setting up openmediavault (2.2.3) ...
/etc/openmediavault/config.xml:1.1: Document is empty

^
/etc/openmediavault/config.xml:1.1: Start tag expected, '<' not found

^
/etc/openmediavault/config.xml:1.1: Document is empty

^
/etc/openmediavault/config.xml:1.1: Start tag expected, '<' not found

^
/etc/openmediavault/config.xml:1.1: Document is empty

^
/etc/openmediavault/config.xml:1.1: Start tag expected, '<' not found

^
/etc/openmediavault/config.xml:1.1: Document is empty

^
/etc/openmediavault/config.xml:1.1: Start tag expected, '<' not found

^
Updating configuration ...
Processing triggers for openmediavault ...
Restarting engine daemon ...
monit: Cannot find the control file at ~/.monitrc, /etc/monitrc, /et▒/monit/monitrc, /usr/local/etc/monitrc or at ./monitrc
Restarting OpenMediaVault engine daemon: start-stop-daemon: warning: failed to kill 3900: No such process
omv-engined.
Updating locale files ...
Updating file permissions ...
Purging internal cache ...
Creating index of upgradeable packages ...
Creating index of openmediavault plugins ...
root@NAS:~# omv firstaid
-bash: omv: command not found
root@NAS:~# omv-firstaid
/etc/openmediavault/config.xml:1.1: Document is empty

^
/etc/openmediavault/config.xml:1.1: Start tag expected, '<' not found

^
/usr/sbin/omv-firstaid: 262: [: -gt: unexpected operator
Updating web administration settings. Please wait ...
{"response":null,"error":{"code":7001,"message":"Failed to connect to socket: No such file or directory","trace":"exception 'OMVException' with message 'Failed to connect to socket: No such file or directory' in \/usr\/share\/php\/openmediavault\/rpc.inc:135\nStack trace:\n#0 \/usr\/sbin\/omv-rpc(107): OMVRpc::exec('WebGui', 'setSettings', Array, Array, 2)\n#1 {main}"}}
Failed to execute RPC (service=WebGui, method=setSettings)

Now the odd part, it states Linux NAS 3.2.0-4, I have never upgraded past 2.1, at least to my knowledge.

That worked to get me logged in with errors.

Last login: Fri May 6 22:49:38 2016 from desktop-725rbjc.local
root@NAS:~# cp /usr/share/openmediavault/templates/config.xml /etc/openmediavault/
root@NAS:~# apt-get install --reinstall openmediavault
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 55 not upgraded.
Need to get 0 B/806 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 35215 files and directories currently installed.)
Preparing to replace openmediavault 2.2.3 (using .../openmediavault_2.2.3_all.deb) ...
Unpacking replacement openmediavault ...
Setting up openmediavault (2.2.3) ...
Updating configuration ...
Processing triggers for openmediavault ...
Restarting engine daemon ...
monit: Cannot find the control file at ~/.monitrc, /etc/monitrc, /et▒/monit/monitrc, /usr/local/etc/monitrc or at ./monitrc
Restarting OpenMediaVault engine daemon: .omv-engined.
Updating locale files ...
Updating file permissions ...
Purging internal cache ...
Creating index of upgradeable packages ...
Creating index of openmediavault plugins ...
root@NAS:~# omv-firstaid
Updating web administration settings. Please wait ...
{"response":null,"error":{"code":4000,"message":"Failed to execute command 'export LANG=C; monit -t 2>&1': monit: Cannot find the control file at ~\/.monitrc, \/etc\/monitrc, \/et?\/monit\/monitrc, \/usr\/local\/etc\/monitrc or at .\/monitrc","trace":"exception 'OMVException' with message 'Failed to execute command 'export LANG=C; monit -t 2>&1': monit: Cannot find the control file at ~\/.monitrc, \/etc\/monitrc, \/et?\/monit\/monitrc, \/usr\/local\/etc\/monitrc or at .\/monitrc' in \/usr\/share\/openmediavault\/engined\/module\/monit.inc:56\nStack trace:\n#0 \/usr\/share\/openmediavault\/engined\/rpc\/config.inc(180): OMVModuleMonit->applyConfig()\n#1 [internal function]: OMVRpcServiceConfig->applyChanges(Array, Array)\n#2 \/usr\/share\/php\/openmediavault\/rpcservice.inc(125): call_user_func_array(Array, Array)\n#3 \/usr\/share\/php\/openmediavault\/rpc.inc(79): OMVRpcServiceAbstract->callMethod('applyChanges', Array, Array)\n#4 \/usr\/sbin\/omv-engined(500): OMVRpc::exec('Config', 'applyChanges', Array, Array, 1)\n#5 {main}"}}
Failed to execute RPC (service=Config, method=applyChanges)

No services are currently running and error if I try to enable them.Yet I can still log into PLEX through the browser and mumble still works.

The dashboard is empty so if I click apply button to save configuration change I receive the following error:

Failed to execute command 'export LANG=C; monit -t 2>&1': monit: Cannot find the control file at ~/.monitrc, /etc/monitrc, /et?/monit/monitrc, /usr/local/etc/monitrc or at ./monitrc

Error #4000:
exception 'OMVException' with message 'Failed to execute command 'export LANG=C; monit -t 2>&1': monit: Cannot find the control file at ~/.monitrc, /etc/monitrc, /et?/monit/monitrc, /usr/local/etc/monitrc or at ./monitrc' in /usr/share/openmediavault/engined/module/monit.inc:56
Stack trace:
#0 /usr/share/openmediavault/engined/rpc/config.inc(180): OMVModuleMonit->applyConfig()
#1 [internal function]: OMVRpcServiceConfig->applyChanges(Array, Array)
#2 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)
#3 /usr/share/php/openmediavault/rpcservice.inc(158): OMVRpcServiceAbstract->callMethod('applyChanges', Array, Array)
#4 /usr/share/openmediavault/engined/rpc/config.inc(224): OMVRpcServiceAbstract->callMethodBg('applyChanges', Array, Array)
#5 [internal function]: OMVRpcServiceConfig->applyChangesBg(Array, Array)
#6 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)
#7 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('applyChangesBg', Array, Array)
#8 /usr/sbin/omv-engined(500): OMVRpc::exec('Config', 'applyChangesBg', Array, Array, 1)
#9 {main}

Same error as before. I wonder about the files in the raid array. If I were to use a PCIe SSD and remove the Thumb drive as the OS if I were to loose the data in the array. If I wont then I will order one up and install a fresh version of OMV on the SSD and remove the thumb drive as primary. If the array goes array that would mean moving GB's of data prior to doing so. My only concern is being capable of streaming my music while at work, oh and probably the wifes pictures.

Thanks for the information. I wanted to initially make this move and now that the config file is as it is, I guess the machine is telling me to ^^.