After Migrating the application from EPiServer 6 to 7, we got an exception as below:

"Unable to load one or more of the requested types. The following exception may be a subset of the Type/LoaderException information present - inspect with debugger for complete view.

Check assemblies [ImageVault.EPiServer5, Version 3.2.2.465, Culture=neutral, PublicKeyToken=null] and /or types

[.........................]"

To fix above we added ImageVault.EPiServer7.dll, ImageVault.Core.dll, Newtonsoft.Json.dll, log4net.dll  – all are .net framework 4.0 dlls (Downloaded Image Vault for EPiServer 7 from –

http://world.episerver.com/Download/Other-products/ImageVault/?Version=4) and that introduces compile time error as below:

• The type or namespace name 'Developer' does not exist in the namespace 'ImageStoreNET' (are you missing an assembly reference?)
• The type or namespace name 'IVAlbumTree' could not be found (are you missing a using directive or an assembly reference?)
• The type or namespace name 'IVFileData' could not be found (are you missing a using directive or an assembly reference?)
• The type or namespace name 'IVFileList' could not be found (are you missing a using directive or an assembly reference?)
• The type or namespace name 'Se' could not be found (are you missing a using directive or an assembly reference?)

We are using below DLLs with the version mentioned: 

ImageStoreNet.dll – v2.0.50727,

ImageVaultOfficeData.dll - v2.0.50727,

ImageVault.Core.dll - v4.0.30319,

ImageVault.EpiServer7.dll - v4.0.30319 

Are these errors coming because the versions of ImageStoreNET.dll and ImageVaultOfficeData.dll are not the one that matches EPiServer 7 i.e. because version is not - v4.0.30319? If yes, from where I can get these DLL’s. If not, then what could be the issue?