Pricing
00
In productionProbeginnerPackaging

The build cannot find rclpy

Declare the missing dependency so the package resolves.

Pairs with Packages and workspaces in Learn ROS 2 from the basics. Read the concept first, then diagnose it here.

Unlock this lab with Pro

Operator report

rosdep and the build fail because `rclpy` is not declared.

Ubuntu 24.04, ROS 2 Jazzy, rclpy, a single-package browser workspace

01

System boundary

Trace only the relevant path.

3 nodes
  1. 01source imports rclpy→
  2. 02package.xml depends→
  3. 03build resolvesOUT
02

How this lab works

You diagnose it. No command list.

Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you - finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.

03

Verification

Pass more than the visible symptom.

4 checks
  • rclpy is declared
  • Existing dependencies are kept
  • Hidden regression behavior
  • Root cause explanation