# Type Serial is ambiguous

**URL:** <https://discourse.processing.org/t/type-serial-is-ambiguous/43584>\
**Category:** Electronics (Arduino, etc.)\
**Created:** [December 30, 2023, 3:06am UTC](https://discourse.processing.org/t/type-serial-is-ambiguous/43584 "2023-12-30T03:06:54Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![rototbob](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@rototbob](https://discourse.processing.org/u/rototbob)\
**Post date:** [December 30, 2023, 3:06am UTC](https://discourse.processing.org/t/type-serial-is-ambiguous/43584/1 "2023-12-30T03:06:54Z")

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I’m new to the Processing language. I am trying to run the code for the Arduino Networked Lamp as detailed in the Getting started with Arduino book. I’ve downloaded the program titled ex06 01 processing and I get the following error when I compile it:

The type Serial is ambiguous  
on line 17:

Serial port;

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