At stage 95 on normal difficulty, after I defeated the boss three times, the system prompts "an error"! ! ! This made me unable to complete the task to receive the reward. At that moment, I was very, very indignant. Such an incident was too frustrating. What was the problem?

Due to my imperfect team, the wartime lasted more than 40 minutes. After an hour of hard work, I had to face failure and fail to succeed. I really killed the boss! ! !

The screenshot after defeating the BOSS three times is as follows:

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