System. Web. Extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35 "or one of its dependencies. The system cannot find the specified file. The obvious error is that the Assembly is missing. solution: 1. If your program runs on a server that you can control, install Asp.net Ajax. This is system. web. extensions and other DLL are deployed as GAC; 2. If your program runs on a VM (You do not have permission to install the Program), you need to set the system. web. extensions. DLL and system. web. extensions. design. DLL (usually in c: \ Program Files \ Microsoft ASP. net \ ASP. NET 2.0 Ajax extensions \ v1.0.61025 directory) Copy two DLL files to the bin directory of your web application. This is application-level deployment. Check the code in Web. config.
- <Assemblies>
- <Add Assembly = & quot; system. Web. Extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35 & quot;/>
- </Assemblies>
- <Controls>
- <Add tagprefix = & quot; Atlas & quot; namespace = & quot; system. web. ui & quot; Assembly = & quot; system. web. extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35 & quot;/>
- </Controls>