Error: Mixed mode assembly is built against version 'v2.0.50727' of the runtime...

Question

4.00/5 (1 vote)

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I have already searched on Google but I cannot find any solution regarding this problem.
It gives me solution for project but I have already done that in App.config

My problem is with the deployed software.

ERROR:
----------------

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.   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, Boolean suppressSecurityChecks, StackCrawlMark& stackMark)
   at System.Reflection.Assembly.LoadFrom(String assemblyFile)
   at CrystalDecisions.ReportAppServer.DataSetConversion.DataSetConverter.DataSetProcessingDelegate(IntPtr arg)

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I got error like as I mentioned above. Actually I have already added

XML

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

---------------------------------------------
In my app.config file. project is working fine in debug mode but it is not working in deployed software, when I run my software and open crystal report form, I get this error.

Any idea please help.

Posted 4-Apr-11 22:20pm

sheladiyaketan

Updated 4-Apr-11 22:33pm

Sandeep Mewara

v2

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Sandeep Mewara · Accepted Answer · 2011-04-04T22:35:00

Solution 1

It looks like your Crystal DLL is not .NET Framework 4.0 compatible.

Error says that something is still trying to refer Framework 2.0 though you are trying to run the application on Framework 4.0.
Make sure that all the dll's used and the projects are using/running on Framework 4.0.

In IIS, once you host/deploy it, the Framework selected for the same is 4.0

Posted 4-Apr-11 22:35pm

Sandeep Mewara

Comments

sheladiyaketan 5-Apr-11 6:27am

actually in app.config if i add code

<startup uselegacyv2runtimeactivationpolicy="true">
<supportedruntime version="v4.0" sku=".NETFramework,Version=v4.0">

its works finely in debug mode. but if we install application at any computer and run that software it show me error and software's exe.config not contains the above code ,if i add the above code in software's exe.config then application doesn't read the exe.config file.

Sandeep Mewara 5-Apr-11 6:32am

There must be higher version DLL's on your locat system and missing on server. As said, try to find the wrongly built dll.

sheladiyaketan 5-Apr-11 6:39am

actually i have made one manual data set to generate report that can be a problem? i m using SAP crystal report.and all other required dlls which i need that i had devloped on .net 4.o version.

sheladiyaketan 5-Apr-11 7:40am

finally i got the solution.i just change the framework v4.0 to v2.0

Abhinav S · Accepted Answer · 2011-04-04T22:35:00

Solution 2

It could be that one of the dll's you are referencing is actually running an older version on this particular machine.

Posted 4-Apr-11 22:35pm

Abhinav S

v2

Comments

sheladiyaketan 5-Apr-11 6:58am

thanks

sheladiyaketan 5-Apr-11 7:46am

finally i got the solution.i just change the framework v4.0 to v2.0