# \#roslib

**URL:** https://get-help.theconstruct.ai/tag/roslib/215.md

[Latest](https://get-help.theconstruct.ai/latest.md) · [Categories](https://get-help.theconstruct.ai/categories.md) · [Tags](https://get-help.theconstruct.ai/tags.md)

---

## [Map Stream Not Displayed on Web Interface – Unit 07](https://get-help.theconstruct.ai/t/map-stream-not-displayed-on-web-interface-unit-07/34627)

<div class="topic-metadata">

**Author:** [@motomechatronics](https://get-help.theconstruct.ai/u/motomechatronics)\
**Replies:** 3\
**Last updated:** [February 3, 2025, 9:44am UTC](https://get-help.theconstruct.ai/t/map-stream-not-displayed-on-web-interface-unit-07/34627 "2025-02-03T09:44:21Z")

</div>

Hi everyone, I followed all the steps for the Unit 7 exercise, but nothing is displaying on the canvas. I also encountered an error in the console, as shown in the attached image. I’m using the index.html and main.js fi…

---

## [ROS2D - Exception calling subscribe callback: a bytes-like object is required, not 'str"](https://get-help.theconstruct.ai/t/ros2d-exception-calling-subscribe-callback-a-bytes-like-object-is-required-not-str/25018)

<div class="topic-metadata">

**Author:** [@AlfoChri](https://get-help.theconstruct.ai/u/AlfoChri)\
**Replies:** 5\
**Last updated:** [June 28, 2023, 10:25am UTC](https://get-help.theconstruct.ai/t/ros2d-exception-calling-subscribe-callback-a-bytes-like-object-is-required-not-str/25018 "2023-06-28T10:25:24Z")

</div>

Hi, Does anyone experience the same with me? I am trying to connect the web interface with my own real robot, but in section 9 which is about displaying a map, there was an error “\[rosbridge\_websocket-1\] \[ERROR\] \[16873…