NetBeans: one or more project resources could not be found

When you open an existing java project from NetBeans, you get the following message.

To fix this, click the Close button to close the message. Right-click on the project and select Properties.

In the popped-up Project Properties window, select the Libraries under the Categories, and you will see a list of broken references on the Compile tab.

Select these broken references and click the Remove button to remove them.

Click the Add JAR/Folder button to add the jars needed or refer to this article to create and add the libraries you need for your project.

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