Troubleshooting Kendo UI License Error, Resolving Console Warning, and Watermark on Components

Environment

Product

Progress® Kendo UI for Angular

Description

When upgrading your Kendo UI package or renewing the Kendo UI license, you could encounter issues with the license activation such as the console showing a warning that the license is expired, or there is a watermark on the components indicating an invalid license.

Solution

To resolve the issue, follow these steps:

1. Confirm the expiration date of your license by referring to the Downloading the License key article. Download the key and replace the one that you are using.

2. Clear the Angular cache:

   sh

   rm -rf .angular/cache

   sh

   rmdir /s .angular\cache

   This will clear the cache stored by Angular.

3. If you're setting the license key as an environment variable, verify that there is no older version of the license key. Check both current and legacy variable names:

   Current variable (2025 Q1+):

   sh

   echo $TELERIK_LICENSE

   sh

   Write-Output $env:TELERIK_LICENSE

   sh

   echo %TELERIK_LICENSE%

   Legacy variable (pre-2025 Q1):

   sh

   echo $KENDO_UI_LICENSE

   sh

   Write-Output $env:KENDO_UI_LICENSE

   sh

   echo %KENDO_UI_LICENSE%

   The output should be empty for both variables. If not empty, delete the environment variables and reset them to the new license key using the current TELERIK_LICENSE variable name.

4. Delete the node_modules folder and the lock file (package-lock.json, yarn.lock, or pnpm-lock.yaml depending on your package manager).

5. Clear the package manager cache:

   sh

   npm cache clean --force

   sh

   yarn cache clean

6. Install all the packages:

   sh

   npm install

   sh

   yarn install

7. Activate the license and run the application.

Notes

• Make sure you have a valid Kendo UI license before proceeding with the activation.
• If the issue persists, please contact our support team for further assistance.

Suggested Link

• Setting Up Your Kendo UI for Angular License Key
• License Activation Errors and Warnings
• Adding the License Key to CI Services
• Frequently Asked Questions about Your Kendo UI for Angular License Key