Eclipse: Failed to open editor after updating Eclipse PDT to version 5.0.1.201706221952

I just updated my Eclipse PHP IDE by downloading Eclipse PDT version 5.0.1.201706221952 but it was a bad idea since I can no longer work with Eclipse. I think I ran into an error because I could not open any files of my project, Eclipse file editor seems to be broken. DLTK indexing seems to be broken too (for my current project at least ...). Sometimes the editor can open one of my files, but the file name is not displayed and I cannot save the changes.

I tried to clean my project as I found a similar problem ( Failed to open editor: Editor could not be initialized. NoClassDefFoundError ) but I got a building workspace error.

Any idea on how I can get the Eclipse editor to work?

• Version: Neon.3 Release (4.6.3)
• Build ID: 20170314-1500
• My project uses Symfony 3 (you can provide more details if necessary)

Building workspace error:

Errors occurred during the build.
Errors running builder 'Script Builder' on project 'PROJET_VISA_ECLIPSE'.
java.lang.NoClassDefFoundError: 
org/eclipse/php/internal/core/compiler/ast/visitor/PHPASTVisitor

      

        
        
        
      

    

Startup error:

An internal error occurred during: "Initialize DLTK".
java.lang.NoClassDefFoundError: 
org/eclipse/php/internal/core/compiler/ast/visitor/PHPASTVisitor

      

        
        
        
      

    

Dubture plugin also encounters errors:

com.dubture.twig.core.index.TwigIndexingVisitorExtension.

      

        
        
        
      

    

Editor error: no editor descriptor for id org.eclipse.ui.internal.emptyEditorTab

java.lang.Exception
at org.eclipse.ui.internal.EditorReference.createErrorPart(EditorReference.java:340)
at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:321)