'Intelliji Idea Cannot access org.springframework.plugin.core.Plugin

I am setting up a springboot project in Intelliji Idea from a tutorial course, and having a problem with the message of "Cannot access org.springframework.plugin.core.Plugin". I have read whatever I could pull out from google search, but with no luck and still getting stuck there. I attach the screenshot here and hope someone can help me out.

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Solution 1:[1]

I add import org.springframework.plugin.core.Plugin; and then add to classpath.

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Solution Source
Solution 1 Saimon494