This usually happens when there is an error with other extensions installed on your computer, and they end up interfering with one another.
To check to see if there is another extension interfering with Jungle Scout, please follow these steps:
- Copy and paste this URL to your browser to manage your extensions: chrome://extensions/
- Uncheck or disable all the other installed extensions to make sure they are disabled
- Close Google Chrome and open it back up
- Try to run your extension again
If it works while all the other extensions are disabled that means there is another extension interfering with Jungle Scout. You can go back through and enable the extensions one by one to see which one is blocking it.