Knowledge Base

Value cannot be null. Parameter name: Path 1


When I install PingPlotter, I'm not able to get it to run - a "Value cannot be null. Parameter name: Path 1" prompt keeps coming up. What can I do to get things working?


This error comes up when there's not a system TEMP variable defined on the machine that PingPlotter is trying to run on. There is a way to get things up and running, though.

For Windows 10

  • In the Windows 10 "I'm Cortana. Ask me anything" search box, enter "Environment". Select the "Edit the system environment variables".
  • In the popup box, use the "Environment Variables" button.
  • In the lower box (system variables), look for a variable called "TEMP". If it's missing then keep going. If it's there, then let us know.
  • Hit the "New" button near the bottom.
  • In "Variable Name", enter "TEMP". In Variable value, enter "C:\Windows\TEMP. Hit OK. Close the Environment variables dialog (by hitting OK).
  • Close and relaunch PingPlotter

For Other Versions of Windows (7, 8, etc)

  • From the desktop, right click the Computer icon.
  • Choose Properties from the context menu.
  • Click the Advanced system settings link.
  • Click Environment Variables... located at the bottom.
  • In the section System Variables, click the "New..." button. In the Name field, enter "TEMP" and for the value field, enter "C:\Windows\TEMP".
  • Select OK and close out of previous windows.
  • Close and relaunch PingPlotter

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Article Info

Article Number: 127 | Last Updated: August 23, 2016

This article has been viewed 9551 times since August 23, 2016

Filed Under: PingPlotter


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