# Network Error when starting up Stretch **URL:** \ **Category:** Ask\ **Created:** [April 3, 2023, 5:31pm UTC](https://forum.hello-robot.com/t/network-error-when-starting-up-stretch/653 "2023-04-03T17:31:00Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![jgangemi](https://avatars.discourse-cdn.com/v4/letter/j/8491ac/32.png) [@jgangemi](https://forum.hello-robot.com/u/jgangemi)\ **Post date:** [April 3, 2023, 5:31pm UTC](https://forum.hello-robot.com/t/network-error-when-starting-up-stretch/653/1 "2023-04-03T17:31:00Z")
Hello! I am trying to run roslaunch stretch\_core stretch\_driver.launch and I keep getting the following errors. Has anyone ever seen this before? I am operating Stretch fully tethered (with attached monitor/keyboard/mouse) on pretty strong wifi. I am not sure what is happening, I tried rebooting but still have the same problem. ![image](https://canada1.discourse-cdn.com/flex030/uploads/hello_robot2/original/1X/0f651af37d8fe84c829cb3d5bd2aa7e7c760e8e9.jpeg) ![image](https://canada1.discourse-cdn.com/flex030/uploads/hello_robot2/original/1X/51dd898b0db1825363b4d3c190a71df8fd6026bc.jpeg) ---
**Author:** ![bshah](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.hello-robot.com/bshah/32/55_2.png) [@bshah](https://forum.hello-robot.com/u/bshah)\ **Post date:** [April 3, 2023, 5:46pm UTC](https://forum.hello-robot.com/t/network-error-when-starting-up-stretch/653/2 "2023-04-03T17:46:01Z")
Hi @jgangemi, when you see `RLException: Unable to contact my own server at [...]` while using roslaunch, it means that ROS’s IP address was modified and there isn’t a valid server at that IP address. Likely, because the robot was being used untethered with [ROS Remote Master](https://docs.hello-robot.com/0.2/stretch-tutorials/getting_started/untethered_operation/#ros-remote-master) at some point. You can go back to fully tethered usage by removing the variables that configured ROS Remote Master. These variables are set in your “~/.bashrc” file. Open a new terminal and write `gedit ~/.bashrc`. In the window that pops up, scroll to the bottom, and delete the `ROS_IP` and `ROS_MASTER_URI` variables. ![Screenshot from 2023-04-03 10-40-32](https://canada1.discourse-cdn.com/flex030/uploads/hello_robot2/original/1X/0cc1f2e845e492ec23571102960927cebac8e3eb.png) Hope this helps, let me know if you have any questions! ---
**Author:** ![jgangemi](https://avatars.discourse-cdn.com/v4/letter/j/8491ac/32.png) [@jgangemi](https://forum.hello-robot.com/u/jgangemi)\ **Post date:** [April 4, 2023, 5:18pm UTC](https://forum.hello-robot.com/t/network-error-when-starting-up-stretch/653/3 "2023-04-04T17:18:26Z")
Hi Binit! Thank you for this advice, I had removed those two lines in the bash file but had not rebooted the robot ugh lol. Thank you so much!! ---
**Author:** ![bshah](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.hello-robot.com/bshah/32/55_2.png) [@bshah](https://forum.hello-robot.com/u/bshah)\ **Post date:** [April 4, 2023, 5:36pm UTC](https://forum.hello-robot.com/t/network-error-when-starting-up-stretch/653/4 "2023-04-04T17:36:29Z")
😆 good point! Opening a new terminal also works to refresh the env variables fyi.