1. Open Toolbox
2. Select Tools -> System Info
3. Connect to the controller by clicking on the pencil in the bottom left corner, fill in the IP address and click OK. It may take a few seconds before you see any data.
4. Find the tab called 'Error Log' and click on the blue triangle to open it. The error log should open in a new window.
5. If you want to save the error log click on "Save as...".