undefined reference to `Spawner'
时间: 2023-11-16 20:54:55 浏览: 21
这个错误通常是由于编译器找不到 Spawner 类的定义而引起的。请确保您已经正确地包含了 Spawner 类的头文件,并且已经将其实现编译成目标文件并链接到您的程序中。
如果您已经正确地包含了头文件并编译了实现,但仍然遇到此错误,请检查您的链接器命令行是否正确。您可能需要将 Spawner 类的目标文件添加到链接器命令行中。
相关问题
how to install jupyterhub
To install JupyterHub, you can follow these steps:
1. Install Python 3 and pip on your system if they are not already installed. You can check if they are installed by running the following commands in your terminal:
```
python3 --version
pip3 --version
```
2. Install JupyterHub and its dependencies by running the following command:
```
pip3 install jupyterhub
```
3. Generate a default configuration file by running the following command:
```
jupyterhub --generate-config
```
4. Edit the configuration file (`jupyterhub_config.py`) to customize the settings, such as the authentication method and the spawner. You can find more information about the configuration options in the JupyterHub documentation.
5. Start JupyterHub by running the following command:
```
jupyterhub
```
6. Access JupyterHub by opening a web browser and navigating to `http://localhost:8000` (or the URL specified in the configuration file).
That's it! You should now have JupyterHub up and running on your system.
[qingzhou/controller_spawner-3] process has died [pid 7947, exit code 1, cmd /opt/ros/melodic/lib/controller_manager/spawner joint_state_publisher ackermann_steering_controller __name:=controller_spawner __log:=/home/cmt/.ros/log/5830eddc-1d72-11ee-b9d2-0800274b9a1c/qingzhou-controller_spawner-3.log]. log file: /home/cmt/.ros/log/5830eddc-1d72-11ee-b9d2-0800274b9a1c/qingzhou-controller_spawner-3*.log
这个错误消息表明一个名为 "controller_spawner" 的进程已经终止,并且返回了退出码 1。该进程的命令是 "/opt/ros/melodic/lib/controller_manager/spawner joint_state_publisher ackermann_steering_controller __name:=controller_spawner __log:=/home/cmt/.ros/log/5830eddc-1d72-11ee-b9d2-0800274b9a1c/qingzhou-controller_spawner-3.log"。同时,日志文件路径为 "/home/cmt/.ros/log/5830eddc-1d72-11ee-b9d2-0800274b9a1c/qingzhou-controller_spawner-3*.log"。
这个错误可能是由于许多原因引起的,例如配置错误、资源不足或程序错误。要解决问题,你可以查看日志文件以获取更多详细信息,了解进程终止的原因。你还可以检查命令中的参数和配置是否正确,并确保所需的资源可用。如果问题仍然存在,可能需要进一步调试和排查错误的原因。