I cant start context broker due to "error starting REST interface" - fiware

Question

When I enter the following command:
/etc/init.d/contextBroker start
I get the following output:
Starting contextBroker... cat: /var/run/contextBroker/contextBroker.pid: No such file or directory
pidfile not found [FAILED]
I have two machines where I am practising with context broker and I havent touched the second one in days after I succesfully installed it and managed to receive a post message from a remote weather station.
I see that the directory /var/run/contextBroker/ is actually empty
What should I do to fix this now? reinstal context broker or?
So is this somehow my fault and how do I prevent in the future? I dont want this happening when my app goes live.
EDIT1: the orion version is 0.20.0
EDIT2: I just reinstalled contextBroker and I get the same problem. What are exectly the contents of that directory? Could I maybe just create the files inside?
EDIT3: Since running contextBroker as a system service still yields an unsuccessful start, I also attempted to run it symply by typing:
contextBroker in the command line, after which I get the following response
INFO#14:03:03 contextBroker.cpp[1346]: Orion Context Broker is running
[root#localhost DevF12]# INFO#14:03:03 MongoGlobal.cpp[181]: Successful connection to database
INFO#14:03:03 contextBroker.cpp[1157]: Connected to mongo at localhost:orion
INFO#14:03:03 MongoGlobal.cpp[499]: Database Operation Successful ({ conditions.type: "ONTIMEINTERVAL" })
FATAL#14:03:03 rest.cpp[1013]: Fatal Error (error starting REST interface)
EDIT4: Ok so I tried ps aux | grep contextBroker and the result is:
494 2196 0.0 7.0 688696 135116 ? Ssl Apr21 0:02 /usr/bin/contextBroker -port 1026 -logDir /var/log/contextBroker -pidpath /var/run/contextBroker/contextBroker.pid -dbhost localhost -db orion
root 7299 0.0 6.9 621052 134440 ? Ssl 04:21 0:00 contextBroker -port 1028
root 8870 0.0 0.0 103256 848 pts/0 S+ 08:51 0:00 grep contextBroker
but there simply isnt anything in /var/run/contextBroker/
Should I put contextBroker.pid by myself? and if so, what should the contents be?
EDIT5: I just ran netstat -ntlpd | grep 1026 and the output is:
tcp 0 0 0.0.0.0:1026 0.0.0.0:* LISTEN 2196/contextBroker
tcp 0 0 :::1026 :::* LISTEN 2196/contextBroker
So I guess nothing else but contextBroker is listening?

Answer 1

For the record (it was answered in the comments).
The message FATAL#XX:XX:XX rest.cpp[1013]: Fatal Error (error starting REST interface) means that there is a networking problem. Usually an interface or an already used port.
The usual cause is that there is another instance of Orion running (as a service, for example).
The way to solve it would be to kill the process entirely. Show all Orion processes with ps aux | grep contextBroker and issue a kill -9 <pid>, where <pid> is the process number (the second column of the output of the ps command).