The first reason of the problem might be that you reference to another module/control that has been built using the old .dll files.
First of all you should delete the references of your controls / modules / and add the new ones from the bin
folder of your SitefinityWebApp
project. After that you have to build your custom modules / or controls /, delete the old references from the SitefinityWebApp
project and add the newly built dlls of your updated modules and controls. Finally you have to build the entire solution and the problem should be fixed.
The second reason of the problem might be connected to the version of the reference so can you please try to use bindingRedirect
element it in you web.config file:
For example you can use the source code bellow and make the necessary changes in your versions:
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