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>note For `Telerik UI for ASP.NET AJAX 2025 Q1` or later, check out the [Licence Key Errors]({%slug licensing/license-errors-warnings%}), for prevous versions, please follow the instructions below.
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## DESCRIPTION
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Sometimes when upgrading a Web Site or Web App project to a newer version of Telerik.Web.UI.dll assembly, you may experience license file (licenses.licx) errors like the ones below, which may prevent the compiler to build the solution:
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*[LC : error LC0000: 'Could not load file or assembly 'Telerik.Web.UI, Version=20xx.xxxx.xx, Culture=neutral, PublicKeyToken=121fae78165ba3d4' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)' or Could not load file or assembly 'Telerik.Web.UI, Version=20xx.xxxx.xx, Culture=neutral, PublicKeyToken=121fae78165ba3d4' or one of its dependencies. Invalid pointer (Exception from HRESULT: 0x80004003 (E_POINTER))'](#could-not-load-file-or-assembly)
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*[Could not transform licenses file into a binary resource](#could-not-transform-licenses-file-into-a-binary-resource)
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*[Source controls issues](#source-control-issues)
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*["Thank you for using the Trial Version of Telerik UI for ASP.NET Ajax to build more powerful applications faster" error message in the browser](#getting-a-trial-error-message-when-refreshing-the-page)
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## DESCRIPTION
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As of Q1 2015, the Telerik ASP.NET AJAX uses the standard .NET licensing mechanism, which when adding the Telerik controls in design-time causes Visual Studio to add a license.licx file to the solution. Its purpose is to:
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* combat copyright infringement.
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* provide license holders in the company with statistics on the use of the available licenses.
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### Getting a trial error message when refreshing the page
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The "Thank you for using the Trial Version of Telerik® UI for ASP.NET Ajax to build more powerful applications faster. Purchase the Commercial Version now to get access to all product updates and the Telerik expert support." error is not directly related to the Licenses.licx file functionality, but to that the Telerik.Web.UI.dll is a trial build for demonstration and trial purposes only. You can check the articles below to see how to remove the trial error:
*[Getting tired of seeing trial messages in your ASP.NET AJAX application?](https://www.telerik.com/blogs/getting-tired-of-seeing-trial-messages-in-your-asp-net-ajax-application)
Copy file name to clipboardExpand all lines: knowledge-base/common-licensing-faq.md
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res_type: kb
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---
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## Environment
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<table>
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<tbody>
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<tr>
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<td>Product</td>
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<td>Progress® Telerik® UI for ASP.NET AJAX</td>
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</tr>
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</tbody>
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</table>
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>note For `Telerik UI for ASP.NET AJAX 2025 Q1` or later, check out the [Licensing FAQ]({%slug licensing/licensing-faq%}), for prevous versions, please follow the instructions below.
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## Description
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## Solution
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* How does the Telerik Ajax licensing work in the browser? - if you are using the trial version of the Telerik.Web.UI.dll assembly you will get random trial errors in the browser. The controls do not use license keys so the only way to eliminate the trial error is to purchase a license and to replace the trial assembly with the paid developer's one. See [here]({%licensing/overview%}# licensing) and [here]({%licensing/overview%}#license-limitations) for more information.
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* How does the Telerik Ajax licensing work in the browser? - if you are using the trial version of the Telerik.Web.UI.dll assembly you will get random trial errors in the browser. The controls do not use license keys so the only way to eliminate the trial error is to purchase a license and to replace the trial assembly with the paid developer's one. See [Licensing Overview]({%slug licensing/overview%}) for more information.
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* How does the Telerik Ajax licensing work in the design time of Visual Studio? - Starting from Q1 2015, Telerik UI for ASP.NET Ajax suite follows the standard licensing process of .NET. When you use the controls in the design time, Visual Studio automatically adds a license.licx file to your project. This file is only required during the design phase and does not need to be deployed with the project. The purpose of this license file is to prevent any unauthorized copying of the controls, to provide statistics to license holders within the company about the usage of available licenses, and to send anonymous usage statistics to Telerik's servers (which may result in some network requests being generated). Look [here]({%licensing/overview%}#net-licensing-mechanism) for more details.
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* How does the Telerik Ajax licensing work in the design time of Visual Studio? - Starting from Q1 2015, Telerik UI for ASP.NET Ajax suite follows the standard licensing process of .NET. When you use the controls in the design time, Visual Studio automatically adds a license.licx file to your project. This file is only required during the design phase and does not need to be deployed with the project. The purpose of this license file is to prevent any unauthorized copying of the controls, to provide statistics to license holders within the company about the usage of available licenses, and to send anonymous usage statistics to Telerik's servers (which may result in some network requests being generated). Look [here]({%slug licensing/overview%}#licensing-mechanism) for more details.
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* Is it possible to temporarily hide the trial error message in the browser when using the Trial version of Telerik.Web.UI.dll assembly? - the trial error message appears randomly in the browser and disappears on refresh when the trial version of Telerik.Web.UI.dll is used. To hide the random error you need to purchase a license or to refresh the page. You can find more information in this blog post: [Getting tired of seeing trial messages in your ASP.NET AJAX application?](https://www.telerik.com/blogs/getting-tired-of-seeing-trial-messages-in-your-asp-net-ajax-application).
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