After upgrade from 3.3 to 3.4 for all my plugins I get error about @model in my views

I made something wrong in all my plugins because I get the same type of error:
Compiler Error Message: CS0103: The name 'model' does not exist in the current context
...
Line 2:      Layout = "";
Line 3:  }
Line 4:  @model ConfigurationModel
...

I checked namespaces (anyway, they don't change) and nothing.
Any tips ?!

hi, based on my experiences, it supposed because you specified different model between controller and view. also, you need to recompile your plugin to newest 3.4 nopcommerce framework. GL

But I didn't change passed model type between controler and view.
"Funny" thing is that this problem apear in all my plugins which working well in version 3.3.

I changed reference to MVC ver 5.2, views are not embedded and so on.
My plugins are recompiled with all Nop 3.4 solution and nothing.

OK I fixed ;)
My web.config was wrong.
I just simply copy from other plugin (shiping by weight) and done.
After that I should correct grid sizes for:
var defaultGridPageSize = EngineContext.Current.Resolve<Nop.Core.Domain.Common.AdminAreaSettings>().DefaultGridPageSize;
    var gridPageSizes = EngineContext.Current.Resolve<Nop.Core.Domain.Common.AdminAreaSettings>().GridPageSizes;

and it's working ;)