Failed to Load file or assembly "System. Data. Entitys" or one of its dependencies. The Assembly list definition found does not match the Assembly reference. Solution

The following error is reported today:

 

Solution:

 

You must add references to the assembly "System. Data. Entity, Version = 3.5.0.0, Culture = neutral, PublicKeyToken = b77a5c561934e089.
Check whether the bin directory contains System. Data. Entity. dll Svn does not upload the bin directory.

So you can add the dll reference.

If no, copy it from: C: \ Program Files \ Reference Assemblies \ Microsoft \ Framework \ v3.5.

If not, add:

<Add assembly = "System. Data. Entity, Version = 3.5.0.0, Culture = neutral, PublicKeyToken = b77a5c561934e089"/>
You can.

Finally, check whether you have installed the 3.5 framework, so which assembly is missing in your GAC.

Reference article: "dhl: Type" System. Data. Objects. DataClasses. EntityObject "must be referenced in the assembly" System. Data. Entity"