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I'm getting this error in my Web Application in the SGEN file, after I add a web reference to a third party tool.

Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.

I found this solution but I don't believe that app.config can be added to a Web App. Mixed mode assembly is built against version 'v1.1.4322'

I added this to the web.config but it didn't help. 

<startup useLegacyV2RuntimeActivationPolicy="true">
  <supportedRuntime version="v4.0.30319" sku=".NETFramework,Version=v4.0,Profile=Client" />
</startup>

I also added this to the sn.exe.config file, but that didn't help either:

<startup useLegacyV2RuntimeActivationPolicy="true">

Anyone have any ideas?

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AndeeC
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1 Answers1

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This worked for me: Project-> Right Click-> Properties-> Build->Generate Serialiazation Assembly. Change Value here from "Auto" to Off and build again.

I am not exactly sure why this works but you can read more on generating serialization assembly in this stackoverflow answer.

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SaraNa
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