# I'm in section 4.3.3 trying to build a microROS Client and it has a fatal error

**URL:** <https://get-help.theconstruct.ai/t/im-in-section-4-3-3-trying-to-build-a-microros-client-and-it-has-a-fatal-error/38060>\
**Category:** Introduction to micro-ROS\
**Created:** [September 13, 2025, 1:40am UTC](https://get-help.theconstruct.ai/t/im-in-section-4-3-3-trying-to-build-a-microros-client-and-it-has-a-fatal-error/38060 "2025-09-13T01:40:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![coopster33](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/c/c68b51/32.png) [@coopster33](https://get-help.theconstruct.ai/u/coopster33)\
**Post date:** [September 13, 2025, 1:40am UTC](https://get-help.theconstruct.ai/t/im-in-section-4-3-3-trying-to-build-a-microros-client-and-it-has-a-fatal-error/38060/1 "2025-09-13T01:40:27Z")

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micro\_ros\_arduino.h isn’t recognized so the node will not build. There doesn’t seem to be any libraries at all. Earlier in the class I built a node without any issues.

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**Author:** ![rodrigo55](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/rodrigo55/32/7280_2.png) [@rodrigo55](https://get-help.theconstruct.ai/u/rodrigo55)\
**Post date:** [September 15, 2025, 6:07am UTC](https://get-help.theconstruct.ai/t/im-in-section-4-3-3-trying-to-build-a-microros-client-and-it-has-a-fatal-error/38060/2 "2025-09-15T06:07:58Z")

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Hi @coopster33, welcome to the community!

Are you trying to build your workspace?

Could you share the command you are trying and the error displayed on your terminal output?

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**Author:** ![system](https://get-help.theconstruct.ai/uploads/default/original/2X/9/9d3ce8305cc0d0d9b6e07d15767a6f245c526f1b.jpeg) [@system](https://get-help.theconstruct.ai/u/system)\
**Post date:** [September 20, 2025, 6:08am UTC](https://get-help.theconstruct.ai/t/im-in-section-4-3-3-trying-to-build-a-microros-client-and-it-has-a-fatal-error/38060/3 "2025-09-20T06:08:07Z")

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