The idea project obviously has dependencies, but the file is not displayed, Cannot resolve symbol 'XXX'

Background: Today is Thursday and there are still two weekends left. Yesterday, I got the sdk of Alibaba Cloud VOD for one day, but it still doesn't work. Come over this morning and continue to work on a different idea to see the bestPractice, and then follow the above-mentioned operations, and finally found that there is this file in the dependency, but the demo still shows that there is no such class.
Solution:
then

Clear cache and restart
The problem is solved,I don't know if the reason above is checked, or whether it is caused by clearing the cache.
Reference link:

https://blog.csdn.net/weixin_46822367/article/details/115560302p>

Finally, I wish everyone good health and happiness. If you have any questions, please feel free to give me advice. Thank you