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importing hyperbolic geometry modules

hi everyone, when I type (in SageMath 9.0 Notebook) "from sage.geometry.hyperbolic_space.hyperbolic_point import * ", I get a long answer with bottom line "ImportError: cannot import name complex_number". Thinking it might fix it, I typed "from sage.rings.complex_number import* ", and got again "cannot import name complex_number". Does anyone know a way around this ? thanks in advance Daniel