Unknown license Error

What do you want to achieve?

login to my SquareLine account on the PC application. After updating the application to the latest version Version 1.2.0, I can no longer log in to my account. when I try to log in it says unknown license error. it was working fine on the previous version of the application. now I downgrade the installation to the last version of SquareLine V1.1.1, but it also refuses to log in as well with the same error. I have Free personal use license. I can see the license key in my online SquareLine Account.

What have you tried so far?

Uninstalling and reinstalling the application & downgrade to the last version 1.1.1

Screenshot or video


  • SquareLine Studio version: Version 1.2.0
  • Operating system: Windows 10
  • Target hardware: ESP32 Arduino
1 Like


Please send your email address to forum@squareline.io so that we can check it.

Hi, Suddenly I am also the same problem . How to get it fixed ?


Please check if the data and time of your PC is set correctly.

Hi, I am also the same problem . How to get it fixed ?
I already send a mail to forum@squareline.io

I also have this problem, date and time are correct

Are you using the latest SLS?( v1.3.1)

I am also the same problem . I encountered an error message that reads as follows: “ERROR: unknown license error!!”
I already send a mail to forum@squareline.io
Please let me know the steps I should take to rectify the aforementioned login issue.

EDIT : the problem is resolved now , my date and time aren’t correct

Same issue. ERROR: license error. no data.


Several days ago we refreshed the error messages on the server. So you may try to log in again and in case you face an issue again, please report the exact message to us.