I'm trying to to save syslog and saving logs with a specific hostname based on the IP address. I'm using a if statement and a vaiable to define the file path I want to use. unfortunately I'm getting the folloging error message: nxlog.conf:32; couldn't parse statement at line 36, character 9 in C:\Program Files\nxlog\conf\nxlog.conf; function 'create_var()' does not exist or takes different arguments. 

My conf file is below. Any hint? 

define ROOT C:\Program Files\nxlog
Moduledir %ROOT%\modules
CacheDir C:\syslog
Pidfile C:\syslog\nxlog.pid
SpoolDir C:\syslog
LogFile C:\syslog\nxlog.log

<Extension exec>
    Module xm_exec
</Extension>

<Extension syslog>
    Module xm_syslog
</Extension>

<Input syslog514udp>
    Module       im_udp
    Port         514
    Host         0.0.0.0
</Input>

<Input syslog514tcp>
    Module       im_tcp
    Port         514
    Host         0.0.0.0
</Input>

<Output consolefile>
    Module      om_file
    
    #defining log path based on hostname
    <Exec>
        if $MessageSourceAddress == "10.1.62.61"
        {   
            create_var('logPath', 'MySBC/Syslog-'+ strftime(now(), '%Y-%m-%d-%H') + '.log')
        }
        else
        {
            create_var('logPath', $MessageSourceAddress+'/Syslog-'+ strftime(now(), '%Y-%m-%d-%H') + '.log')
        }
    </Exec>
    
    File      get_var('logPath')
	
    # Addiere Zeitstempel an den Event
    Exec        $raw_event = now() + " " + $raw_event;
	<Exec>
		if consolefile->file_size() >= 100M
		{	
			$newfile = $MessageSourceAddress+"/Syslog-"+ strftime(now(),"%Y-%m-%d-%H-%M") + ".log";
			consolefile->rotate_to($newfile);
		}
	</Exec>
    CreateDir   TRUE
</Output>

<Output cdrlogger>
    Module      om_udp
    Host        127.0.0.1
    Port        1514
</Output>

<Route udp>
    Priority	1
    Path        syslog514udp => consolefile, cdrlogger
</Route>

<Route tcp>
    Priority	2
    Path        syslog514tcp => consolefile, cdrlogger
</Route>