RT,我一不注意在 https://www.luogu.com.cn/training/101095 中移除一道题之前删除了这道题,然后怎么都进不去这个题单了,显示 Return value of Luogu\Model\Training\TrainingProblem::getProblem() must be an instance of Luogu\Model\Problem\Problem, null returned。
Return value of Luogu\Model\Training\TrainingProblem::getProblem() must be an instance of Luogu\Model\Problem\Problem, null returned