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Dear AleksandarK,

This is not a design “error”, but as Python indicates a TypeError: The phase shifter here does not have a keyword parameter “width”.

In building blocks you basically never set the cell width directly, but possibly other parameters that may affect the cell width.

Note that all interconnects do have a “width” keyword. Hence, if needed, adapt the interconnect to the building block pin width when connecting, e.g. with a “taper” or “ptaper”. See also here