[Spce-user] I'm terribly sorry, server error occurred (1/SL)

[cappellari at connectlife.it]

Hi, today we had all incoming and outgoing calls barred. On the logs of the kamailio-lb service we had this error: 

Reply from Inbound - S=500 - I'm terribly sorry, server error occurred (1/SL) 

A server restart fixed the situation 
What could this be due to? 

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