What is the reason why Li Bai was exiled?

Lushan revolted, with Ming Di in Shu and Yongwang in the southeast. I became my assistant when I was lying on Lushan Mountain. Lin rebelled and fled to Pengze for nothing. Lost, tired of Xunyang prison. At the beginning, I made a trip for nothing and met Guo Ziyi. He was surprised and saved him from death. When he arrived, Guo Ziyi asked the officer to redeem him, and he sent a letter to show mercy to Yelang.

During the Anshi Rebellion, Xuanzong took refuge in Shu, and Li Lin, Emperor Yongli, ruled the southeast region. At that time, Li Bai lived in seclusion in Lushan Mountain and was recruited as a strategist by Li Lin. Later, Li Lin rebelled and Li Bai fled back to Pengze. After Li Lin failed, Li Bai was implicated in Xunyang prison. At first, Li Bai wandered to Bing and met Guo Ziyi. He thinks this man is different, because he saved Guo Ziyi from the death penalty. At this time, Guo Ziyi applied to the imperial court to remove his official position to redeem Li Bai's death, so the emperor decided to change Li Bai to exile Yelang.