Allocating specialised state sampler for state space

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Hi, I am trying to apply a position constraint in the planning using RRTconnect with these parameters: longest_valid_segment_fraction = 0.17, and optimization objective: PathLengthOptimizationObjective, on the terminal it does say solution found, however, right after it says Allocating specialized state sampler for state space and takes forever and never ends. I am wondering what could be causing this problem? Any help will be appreciated! Thanks!