I installed WindowBuilder in Eclipse to create a Graphical User Interface for a program. When I go to the Design tab of the User Interface, the following error appears:
Eclipse is running under 1.8, but this Java project has at 10 Java compliance level, so WindowBuilder will not be able to load classes from this project. Use a lower level of Java for the project, or run Eclipse using a newer Java version.
Currently I have Java 8 (update 171) installed, and the Oxygen.3a (4.7.3a) version of Eclipse. Previously I had installed version 10 of Java, but I read that there is a bug where WindowBuilder does not work in that version, and that it is recommended to use 8 (that's why I uninstalled Version 10 and installed this one). But the error persists. I read that maybe I have to install an old version of Eclipse, but if I do I have to uninstall the current one (and therefore lose all the University projects). I would also be looking for a solution to that, if they can be exported in any way.
Thank you!