将一组文字材料进行自动摘要，输出1到2个句子的摘要。
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Github, the leading provider of open-source software hosting services, suffered a major outage in the summer of 2018. For over 24 hours, developers were unable to access many of the company's core services, including code repositories and project issue trackers. The outage was caused by a simple human error: a maintenance worker accidentally disconnected a series of network cables, which triggered an automation system that did more harm than good. 
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In 2018, Github experienced a major outage that lasted for over 24 hours due to a human error. This caused developers to lose access to crucial services such as code repositories and project issue trackers.