# Custom Service Server 3.3

**URL:** <https://get-help.theconstruct.ai/t/custom-service-server-3-3/1005>\
**Category:** ROS Basics In 5 Days (Python)\
**Tags:** error\
**Created:** [October 10, 2019, 5:54pm UTC](https://get-help.theconstruct.ai/t/custom-service-server-3-3/1005 "2019-10-10T17:54:04Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![bayodesegun](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/bayodesegun/32/10684_2.png) [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\
**Post date:** [October 10, 2019, 7:21pm UTC](https://get-help.theconstruct.ai/t/custom-service-server-3-3/1005/10 "2019-10-10T19:21:31Z")

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Hi @josho.wallace,

> [@josho.wallace](#):
>
> I did not type the correct package name in the launch file. So the error is caused because it can’t find the package. Why does all the other ROS path stuff come up?

That came up because ROS was trying to find the package/python file.

I suppose the error is resolved now? If not, please also check that the python file is executable and and that the name is correct:

> **[ERROR: cannot launch node of type \[package/file.py\]: can't locate node...](https://get-help.theconstruct.ai/t/error-cannot-launch-node-of-type-package-file-py-cant-locate-node-file-py-in-package-package/54)**
>
> This error is very common when using ROS to launch a python node, either via rosrun or roslaunch. SOLUTION: Does the file file.py… exist in the package package? If not, create it! (Does the package itself exist and is it spelled correctly?)....

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