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How to eradicate "Parse Error: "Autocomplete is ambiguous in the namespace 'SyncFusion.JavaScript.Web'" occurs while running the ASP.NET sample"?

Platform: ASP.NET Web Forms |
Control: General |
Product Version:
Tags: ambiguous


Parse Error: "Autocomplete is ambiguous in the namespace ‘SyncFusion.JavaScript.Web’" occurs while running the ASP.NET sample having Syncfusion Tools controls.

The following screenshot displays the error.



Figure 1: Error


This error occurs due to the mismatching of DLL version referred in your sample, when the assemblies referred in the application and the .NET Framework version of the application are different.


To resolve this issue, you need to refer the assembly DLL version that matches with the framework version used in the application.

And also, all the assemblies referred inside the web.config file should match your .NET framework version.

When you are using and the frame work version is 4.6, then the DLL version should be 13.4460.0.53. Check the bin folder and refer the following table for DLL reference.

Table 1: DLL Reference

 .Net Frame Work Version

DLL Reference









Follow the given steps:

  1. Right-click on the sample and select “Open file in Explorer”.
  2. Inside the Project folder, you get the bin folder.
  3. Check the version of DLLs inside the bin folder.

When the assemblies are referred from GAC reference, follow the provided steps.

  1. Open Solution Explorer in the application, click on References and get the Syncfusion.EJ and Syncfusion.EJ.Web assembly references.
  2. View the properties by right-clicking the Syncfusion.EJ.Web, inside references.
  3. Check the version of the assembly in the Properties tab.


Properties tab

Figure 2: Properties tab

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Megan branca
Aug 08, 2017

Does not say how to upgrade the DLLs

Arun Palaniyandi [Syncfusion]
Aug 09, 2017

Hi Megan branca,


Download and install the latest version or your preferred version of Essential Studio.


Then follow the project migration steps in the below link.





Arun P.


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