[solved] the project cannot be built until path errors are resolved

the project cannot be built until path errors are resolved:

Error:

the project cannot be built until path errors are resolved

How I solved ?

• The error may occur due to incompaible jar with the imported project.
• Right click on the project -> build path -> configure build path -> libraries (tab probably third one) and remove the jre which is there with red exclamation mark, and add the jre which is there in the machine by  simply clicking add library.

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