Conversation so far:
What team did Faouzi Chaouchi start his international career with?
Faouzi Chaouchi received his first call-up to the Algerian national team for JS Kabylie on 4 February 2008 for training.
Did Faouzi Chaouchi play with any other international clubs as opponents?
On 26 March 2008, Faouzi Chaouchi made his debut for Algeria in a friendly against DR Congo coming on as a substitute at half-time for Lounès Gaouaoui.
Are there any other interesting aspects about Faouzi Chaouchi's international career besides what team Chaouchi started his international career with, and also playing for Algeria?
Faouzi Chaouchi started his country's first match of the World Cup against Slovenia and was at fault for the Slovenian winner scored by captain Robert Koren.

Question: how was he at fault?
Self-contained rewrite: how was Faouzi Chaouchi at fault for the Slovenian winner scored by captain Robert Coren?