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How to setup Eclipse IDE for Ruby projects under Linux

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This question already exists here, but I was advised to open a new one.

For me on Ubuntu 24, the text editor fails to show anything, showing the error:

org.eclipse.core.runtime.CoreException: Plug-in "org.eclipse.dltk.ruby.ui" was unable to instantiate class "org.eclipse.dltk.ruby.internal.ui.editor.RubyEditor".    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:242)....

(and many hundreds of lines more, similar to this). I have downloaded the All-in-One DLTK SDK - includes binaries and source code of DLTK Core Frameworks, Ruby IDE and TCL IDE for Eclipse Platform 3.3 package ([from here][2]), and copied and pasted the files from the plugins and feature folders to the ones of my eclipse directory.

When I also install the TLC DLTK from Help->Install new software, the script explorer shows my project folder and I can generate Ruby files etc., but than cannot configure the interpreter any more, getting this error message:

Unable to create the selected preference page.org/eclipse/dltk/internal/debug/ui/interpreters/InterpreterPreferencePage 

My Ruby interpreter is set to usr/bin/ruby, which is what comes up for which ruby in my terminal.

Does anybody know how I could resolve my setup ? My eclipse is the one for C/C++.

my eclipse screen with Rubin perspective available, but browser and editor UI not working


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