Cannot load Rethinking Voxels

I was trying to load Rethinking Voxels, but it doesn't seem to work. It just reverts back to normal rendering. Other shaders, including upsteam Complementary Reimagined and path tracing shaders like SEUS PTGI and Soft Voxels Lite work fine.

This is a snippet of the logs. I can't copypaste the whole thing since it would be too long for the post.

[04:36:08] [Render thread/ERROR]: Failed to load the shaderpack "rethinking-voxels_r0.1_beta2.zip"!
[04:36:08] [Render thread/ERROR]: 
java.lang.IllegalStateException: An SSBO is being used, but the feature flag for SSBO's hasn't been set! Please set either a requirement or check for the SSBO feature using "iris.features.required/optional = ssbo".
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