BC Framer Hanger Error - Properties Window. Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Here is an illustration of the BC Framer® software error message this applies to:


We are not sure why this happens, but to resolve it you should be able to just click the "Geometry Only Connectors" tool. This should resolve the error.
If this doesn't work, click "Reset Analysis Model" and try the "Geometry Only Connectors" tool again.