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License Activation Errors and Warnings
Updated on Aug 17, 2026
Starting with the Q2 2025 release, Telerik JustMock will display specific warnings and errors if used without a valid license or with an invalid one. This article explains what defines an invalid license, the possible reasons behind it, and the related warnings and errors you might encounter.
A missing, expired, or invalid license will result in a warning message similar to the following appearing in the test run output:
Warning: [TKL101] Progress® Telerik® JustMock is not listed in your current license file.
Invalid License
An invalid license can be caused by any of the following:
- Using an expired subscription license—subscription licenses expire at the end of the subscription term.
- Using a perpetual license for product versions released outside the validity period of your license.
- Using an expired trial license.
- A missing license for Telerik JustMock.
- Not installing a license key in your application.
- Not updating the license key after renewing your Telerik JustMock license.
License Warnings and Errors
When working on a project with Telerik JustMock and encountering an expired or missing license, the test execution will display the following errors:
| Error Message | Message Code | Solution |
|---|---|---|
Unable to locate licenses for all products | TKL004 | Your license is not valid for all Telerik and Kendo products added to your project. If you have already purchased the required license, then update your license key. |
Your subscription has expired. | TKL103; TKL104 | Renew your subscription and download a new license key. |
Your current license has expired. | TKL102 | You are using a product version released outside the validity period of your perpetual license. To resolve this issue, you can either: |
| - Renew your license, then download a new license key and use it to activate the controls. | ||
| - Downgrade to a product version included in your perpetual license as indicated in the message. | ||
Your trial expired. | TKL105 | Purchase a commercial license to continue using the product. |
Telerik JustMock is not listed in your current license file. | TKL101 | Review the purchase options for the listed products. |