An internal error occurred during: “Updating Maven Project”. Preference node “org.eclipse.wst.validation” has been removed

Same probleme here, there the solution I fix it

• Open the .project file with your prefered text editor.

• delete the node that is about “org.eclipse.wst.validation”

• Close your project

• Open your project

• Launch Maven Update…

Should be good.

Another way to fix it, if you don’t want to change your .project config
(or if you had several projects that must be fixed)

• Close your workspace (or eclipse)

-move out <WorkspaceDir>\.metadata\.plugins\org.eclipse.core.resources\.projects from the workspace directory

-reopen you workspace

• close it again

-move back the .projects dir (say yes to replace questions ? )

• open you workspace

• Launch Maven Update

Should be good