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Hello, first of all thanks for developing Eclipse. It has helped me to do work for a few months already. :) So this is the problem that appeared today: I am trying to open a file with WindowBuilder, yet this message appears- Plug-in org.eclipse.wb.core.ui was unable to load class org.eclipse.wb.internal.core.editor.multi.DesignerEditor. What is the reason and what is there to do? Your answer is very important. Please answer. Thankyou, Duarte
Please attach the full error stack trace and versions of your Eclipse, Window builder etc.