Object reference not set to an instance of an object. stacktrace: at Bentley.bulding.mechanical.components.port.getinvalue ( string propname) at Bentley.building.mechanical.components.port. at Bentley.building.mechanical fittingplacementtool.createcomponent at Bentley.building.mechanical.noninlineplacmenttool._ondatabutton (object sender, buttonevnetargs e)
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