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Copy file name to clipboardExpand all lines: knowledge-base/spreadsheet-understanding-telerik-ajax-and-document-processing-library-spreadsheet-workbook-and-worksheets.md
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- An instance method .ToDocument() that all allows any AJAX Workbook instance to be converted to a DPL Workbook;
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- A static method Workbook.FromDocument() that allows any DPL Workbook to be converted to an AJAX Workbook;
Copy file name to clipboardExpand all lines: licensing/license-errors-warnings.md
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An invalid license can be caused by any of the following:
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* Using an expired subscription license—subscription licenses expire at the end of the subscription term.
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* Using a perpetual license for product versions released outside the validity period of your license.
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* Using an expired trial license.
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* A missing license for Telerik UI for ASP.NET AJAX.
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* Not installing a license key in your application.
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* Not updating the license key after renewing your Telerik UI for ASP.NET AJAX license.
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- Using an expired subscription license—subscription licenses expire at the end of the subscription term.
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- Using a perpetual license for product versions released outside the validity period of your license.
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- Using an expired trial license.
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- A missing license for Telerik UI for ASP.NET AJAX.
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- Not installing a license key in your application.
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- Not updating the license key after renewing your Telerik UI for ASP.NET AJAX license.
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## License Warnings and Errors
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When using Telerik UI for ASP.NET AJAX in a project with an expired or missing license, the `Telerik.Licensing` build task will indicate the following errors:
|`No license key is detected`|`TKL002`|[Set up a license key]({%slug licensing/license-key%}) to activate the UI controls and remove the error message.|
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|`Invalid license key`|`TKL003`|[Download a new license key]({%slug licensing/license-key%}#downloading-the-license-key) and use it to activate the UI controls and remove the error message.|
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|`Your subscription license has expired.`|`TKL103`, `TKL104`|Renew your subscription and [download a new license key]({%slug licensing/license-key%}#downloading-the-license-key).|
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|`Your perpetual license is invalid.`|`TKL102`| You are using a product version released outside the validity period of your perpetual license. To remove the error message, do either of the following:|
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||| - Renew your license, then download a new license key and use it to activate the controls. |
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||| - Downgrade to a product version included in your perpetual license as indicated in the message.|
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|`Your trial license has expired.`|`TKL105`|Purchase a commercial license to continue using the product. |
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|`Your license is not valid for the detected product(s).`|`TKL101`|Review the purchase options for the listed products. Alternatively, remove the references to the listed packages from `package.json`.|
|`No license key is detected`|`TKL002`|[Set up a license key]({%slug licensing/license-key%}) to activate the UI controls and remove the error message. |
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|`Invalid license key`|`TKL003`|[Download a new license key]({%slug licensing/license-key%}#downloading-the-license-key) and use it to activate the UI controls and remove the error message. |
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|`Your perpetual license is invalid.`|`TKL102`|You are using a product version released outside the validity period of your perpetual license. To remove the error message, do either of the following: |
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||| - Renew your license, then download a new license key and use it to activate the controls. |
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||| - Downgrade to a product version included in your perpetual license as indicated in the message. |
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|`Your subscription license has expired.`|`TKL103`, `TKL104`|Renew your subscription and [download a new license key]({%slug licensing/license-key%}#downloading-the-license-key).|
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|`Your trial license has expired.`|`TKL105`| Purchase a commercial license to continue using the product.|
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|`Your license is not valid for the detected product(s).`|`TKL101`|Review the purchase options for the listed products. Alternatively, remove the references to the listed packages from `package.json`.|
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|`No Telerik or Kendo UI product references detected in project.v.`|`TKL001`|- If you use Telerik products and see this message, update the Telerik.Licensing package to version 1.4.9 or later. |
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||| - If you do not use Telerik products, remove the Telerik.Licensing NuGet reference from your project. |
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## See Also
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*[Setting Up Your License Key]({%slug licensing/license-key%})
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*[Adding the License Key to CI Services]({%slug licensing/add-license-to-ci-cd%})
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*[Frequently Asked Questions about Your Telerik UI for ASP.NET AJAX License Key]({%slug licensing/licensing-faq%})
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