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Mysterious "must have a value" error

I am using CoCalc to experiment with some GAP functionality in Sage. I am trying to run the following code.

G = gap.SmallGroup(64, 134)
R = gap.ResolutionPrimePowerGroupRadical(G, 10)

This yields the following error.

RuntimeError: Gap produced error output
Error, Variable: 'ResolutionPrimePowerGroupRadical' must have a value

What does this mean, and how do I solve this issue?