Idea error: (4, 46) Java: package org.springframework.boot . autoconfigure does not exist problem solving

IDEA Error: (4, 46) Java: package org. Springframework. Boot. The autoconfigure no problem problem solving:
the first step, you can try to import:

the second step, if the previous step was useless, can open the console, enter MVN -u IDEA: the IDEA of download did not finish download package