filename() is unknow

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Hi I downloaded and install nxlog-ce-3.0.2272_rhel8.x86_64.rpm on Centos 8 server I it is my first installation on centos 8. I used before only Centos 7 with nxlog. I copied input configuration from other server . and sending data to graylog But field FileName now unknown instead name of file . Rest of fields work excellent

<Input log> Module im_file

File	&quot;/var/log/*&quot;
SavePos	TRUE
ReadFromLast TRUE

Exec	$Message = $raw_event;
Exec	$FileName = file_name();