'eclipse rcp text editor fording

I am currently trying to implement text editor folding in Eclipse rcp e4.

https://www.eclipse.org/articles/Article-Folding-in-Eclipse-Text-Editors/folding.html#projectionSupport

I followed the example of the site, but a null exception occurred:

"org.eclipse.ui.texteditor.AbstractTextEditor.getSite()" is null

How can I solve this problem?

eclipse-rcprcpe4


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