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+---
+title: Resolving Compile Time Error with Telerik.Documents.Fixed and Telerik.Reporting after Upgrading to Q4 2024
+description: This article explains how to solve the compile time error caused by conflicting types between RadPdfProcessing and Telerik.Reporting when upgrading to Q4 2024.
+type: how-to
+page_title: Fixing Compile Time Error Between Telerik.Documents.Fixed and Telerik.Reporting after Upgrading to Q4 2024
+slug: resolve-compile-time-error-radpdfprocessing-telerik-reporting
+tags: pdfprocessing, document, processing, compile, error, size, conflict, extern, alias, reporting
+res_type: kb
+ticketid: 1670534
+---
+
+## Environment
+
+| Version | Product | Author | 
+| --- | --- | ---- | 
+| 18.3.24.1112| Telerik.Reporting|[Desislava Yordanova](https://www.telerik.com/blogs/author/desislava-yordanova)| 
+|2024.4.1106|RadPdfProcessing (.NET Standard)||
+
+## Description
+
+If you have the [Telerik.Reporting](https://docs.telerik.com/reporting/introduction) NuGet package (**18.3.24.1112**) installed simultaneously with the **Telerik.Documents.Fixed** NuGet package, a compile time error occurs:
+
+The type 'Size' exists in both 'Telerik.Documents.Core, Version=2024.4.1106.20, Culture=neutral, PublicKeyToken=5803cfa389c90ce7' and 'Telerik.Reporting, Version=18.3.24.1112, Culture=neutral, PublicKeyToken=a9d7983dfcc261be'
+
+>note This undesired behavior is not reproducible with the previous version of Telerik Reporting. It is caused due to the fact that Telerik.Documents.Primitives.Size is contained in both assemblies/packages with the same namespace.
+
+## Solution
+
+To resolve the compile time error caused by the conflicting 'Size' type in both  assemblies, use the C# **extern alias** feature. Follow these steps to implement the solution:
+
+1. Select the Telerik.Documents.Fixed NuGet package and set its Alias to DPLHelper (or whatever you want):
+
+    ![DPLHelper](images/DPLHelper.png)
+
+1. Select the Telerik.Reporting NuGet package and set its Alias to ReportingHelper (or whatever you want):
+
+    ![ReportingHelper](images/ReportingHelper.png)
+
+1. **Use Extern Alias in Your Code**: At the top of your source file, add the [extern alias`](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/extern-alias) directive for each alias you assigned. This differentiates the namespaces, allowing you to use types from both assemblies without conflict.
+
+1. **Adjust Your Code to Use the Aliased Namespaces**:
+
+```csharp
+extern alias DPLHelper;
+extern alias ReportingHelper;
+
+using DPLHelper::Telerik.Windows.Documents.Fixed.Model.Editing;
+using DPLHelper::Telerik.Windows.Documents.Fixed.Model;
+
+namespace YourNamespace
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            RadFixedDocument fixedDocument = new RadFixedDocument();
+            RadFixedPage fixedPage = fixedDocument.Pages.AddPage();
+            fixedPage.Size = new Telerik.Documents.Primitives.Size(210,297);
+            FixedContentEditor fixedEditor = new FixedContentEditor(fixedPage);
+        }
+    }
+}
+```
+
+This approach allows you to explicitly specify which 'Size' class to use, thereby resolving the compile time error and allowing your project to build successfully.
+
+## See Also
+
+- [Telerik Document Processing Libraries Overview]({%slug introduction%})
+- [Feedback Portal Entry for Compile Time Error in Q4 2024](https://feedback.telerik.com/reporting/1670554-compile-time-error-occurs-after-upgrading-to-q4-2024)
+- [Extern Alias](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/extern-alias)