Do you use and UNC share, share storage or load balancer for the project. How do you connect to the project?
If you have two servers or two projects could you verify that the bothuse the same version of Sitefinity? If youhave different versions of sitefinity - this should be the problem. The error is indicating that you are missing a dependency, not the physical assembly. Make sure that the application can find all of the assemblies that your Web Application project references. Referencing the source assembly over the network could be your problem. Make sure that the "NETWORK SERVICE" or "ASPNET" user has permissions over the assemble and the folder where it resides. You could try to use dependency walker to see whether there are any relations.
Could you try the following
Take the dynamic assembly from the \[YourProject]\Sitefinity\Service Assemblies and place it in [YourProject]\bin directory. The bin directory is a standard place for the assemblies (as well as the GAC), the binding should work just fine.Asp.Net looks for assemblies in the following manner: System GAC -> Project/App Bin directory -> Custom Directories. In other words, it goes through the bin directory anyway, so once Sitefinity founds the needed assembly there, everything should be fine.
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