Error 391 When Running MPManager Script

Updated Mar 24, 2020

Reported In


  • Micropross Accessories


SW : MPManager 3

HW : MP300, MP500 or MP007 family

Issue Details

I'm trying to run a MPManager script, but when I run it, I've got an error "Invalid License. You need a valid license to use this feature. (error 391)" in the script log. 



Some features are available only if a special license is activated on your device. 

You can check which licenses are currently installed on your Micropross device directly from the "Connection" pannel of MPManager 3 :
If the test you're trying to run requires a license which is not available on your device, you'll get this error.

If you need to add licenses on your device, please contact your sales representative at to buy this license.