This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded

Question

I m getting the error   This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded    I have a  NET 4 0 dll project that is being called by a  NET 2 0 project   Is there a way to reconcile the difference in framework

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When I changed the  Net frame work version of the App pool in which the particular project was hosted  I was able to resolve this particular issue   App pool -  advanced settings -   Net frame work version  changed v2 0 to v4 0

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The error was due to the way that I configured the Application Pool in IIS   My web service uses an Application Tool configured for v2 0 50727   This resulted in the error message   When I changed it to v4 0 30319  I did not get the error

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I got this error too  but my problem was that I was using an older version of GACUTIL EXE   Once I had the correct GACUTIL for the latest  NET version installed  it worked fine   The error is misleading because it makes it look like it s the DLL you re trying to register that incorrect

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I have a  NET 4 0 dll project that is being called by a  NET 2 0 project  Is there a way to reconcile the difference in framework    Not that way round  no  The  NET 4 CLR can load  NET 2 assemblies  usually - there are a few exceptions for mixed-mode assemblies  IIRC   but not vice versa   You ll either have to upgrade the  NET 2 project to  NET 4  or downgrade the  NET 4 project to  NET 3 5  or earlier

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I got same error message  I was giving     C  WINDOWS Microsoft NET Framework v2 0 50727 InstallUtil exe    C  MyService MyService exe    Instead of     C  WINDOWS Microsoft NET Framework v4 0 30319 InstallUtil exe    C  MyService MyService exe

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Interestingly  I kept getting that error  What fixed it for me was creating a config called gacutil exe config in the same directory as gacutil exe  The config content  a text file  were    lt  xml version   1 0   gt   lt configuration gt       lt startup useLegacyV2RuntimeActivationPolicy  true  gt           lt requiredRuntime safemode  true  imageVersion  v4 0 30319  version  v4 0 30319   gt       lt  startup gt   lt  configuration gt    I m posting this here for reference and ask if anyone knows what s actually happening under the hood  I m not claiming this is the  proper  way of doing it

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If you have already tried all the other logical solutions on this page  then double check this   In my app config I had a reference to an old framework      lt startup gt     lt supportedRuntime version  v2 0 50727   gt   lt  startup gt    should have been    lt startup gt     lt supportedRuntime version  v4 0  sku   NETFramework Version v4 0   gt   lt  startup gt    The project tab correctly showed v4 0 but the app config was not committed to our repo with that change   To fix it  I changed the framework to something else and back to 4 0 again  which updated my app config file

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This error may also be triggered by having the wrong  NET framework version selected as the default in IIS   Click on the root node under the Connections view  on the left hand side   then select Change  NET Framework Version from the Actions view  on the right hand side   then select the appropriate  NET version from the dropdown list

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Since only one version of the run-time can be loaded into a process  although  as others have alluded  backwards loading - 4 0 loading 2 0 - is okay   you have a few options    Upgrade the  Net 2 0 project Wrap the  Net 2 0 project  if the source is not yours  Downgrade the  Net 4 0 project Load the  Net 4 0 project into it s own process  I believe this can work - but will take a bit of effort  IMO

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Change INSTALL UTIL HOME directory from C  WINDOWS Microsoft NET Framework v2 0 to C  WINDOWS Microsoft NET Framework v4 0 30319 for installing the service  This error mainly occurs for version mismatch

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You ll either have to upgrade the  NET 2 project to  NET 4  or downgrade the  NET 4 project to  NET 3 5  or earlier     How do you upgrade the  net version  I am not sure where to and what to specify  Please help   Edit  I found the answer myself  Select the project   right click and choose Property Pages  There you can select framework version  or select the project and click Shift F4

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Its  net Version mismatch of the dll so try changing to   from  in app config or web config  Generally have a higher Framework than lower because when we add system s dll to the lower version built  net application so it won t work therefore just change to the higher version

[c#] "This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded"

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