Understand zabbix_server.log

[marcqueralt]

I'm experimenting some problems on a Zabbix installation.
The server has the log configured and running ok.
I have a lot of messages like:

13590:20100618:135430 Expression [{17456}=1 & {17455}=1] cannot be evaluated [Format error or unsupported operator.  Exp: ["000010001100000000000000"]]
 13590:20100618:135430 Format error or unsupported operator.  Exp: ["000010001100000000000000"]
 13590:20100618:135430 Format error or unsupported operator.  Exp: ["000010001100000000000000"]

I don't know how to find which is the trigger affected.
Is there any post or document where the zabbix_server.log is explained?
Thank you in advance for your help.

[richlv]

you probably couldn't get more information from the log, but you can at least try to figure out the trigger name from the database :

select description,comments,error from triggers where expression='{17456}=1 & {17455}=1';

[marcqueralt]

Log and database

Thank you for your cooperation.
Following with your query i have been able to understand the items in each functions.