There may be several reasons for the middle and lower component errors in the blog.

1. Botu assembly errors: During the Botu assembly process, errors in the middle and lower components may occur due to improper operation or weak connection.

2. Damage to the middle and lower components: If the middle and lower components themselves are faulty or damaged, it will also cause errors in the middle and lower components in Botu.

3. Program error: There is a problem with Botu's program design, which causes the middle and lower components to be unable to be recognized normally, resulting in an error.