Blacklist Rule Error 22

[Rameez Qureshi <rameez_q () hotmail co uk>]

Here it the problem 

Reputation config: 
WARNING: Can't find any whitelist/blacklist entries. Reputation Preprocessor disabled.

+++++++++++++++++++++++++++++++++++++++++++++++++++
Initializing rule chains...
ERROR: /usr/src/rules/blacklist.rules(22) Unknown ClassType: trojan-activity
Fatal Error, Quitting.

The actual rule inside the blacklist.rule file is as follows:

alert udp $HOME_NET any -> any 53 (msg:"BLACKLIST DNS request for known malware domain datajunction.org - Gauss "; 
flow:to_server; byte_test:1,!&,0xF8,2; content:"|0C|datajunction|03|org|00|"; fast_pattern:only; metadata:impact_flag 
red, policy balanced-ips drop, policy security-ips drop, service dns; reference:url,gauss.crysys.hu/; 
reference:url,www.securelist.com/en/blog/208193767/Gauss_Nation_state_cyber_surveillance_meets_banking_Trojan; 
classtype:trojan-activity; sid:23802; rev:2;)

Any help greatly appreciated!

Thanks
Rameez

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