Error when trying to configure any feed

I have Feed Manager installed on 3.4.  Whenever I try to go to Plugins -> FoxNetSoft Feed Manager -> Feeds and then click on Edit next to any feed, I get the error:  "Error Happened"

If I then go into the NopCommerce logs, I see the following error, which appears to be related:

Method not found: 'Nop.Core.IPagedList`1<Nop.Core.Domain.Catalog.Product> Nop.Services.Catalog.IProductService.SearchProducts(Int32, Int32, System.Collections.Generic.IList`1<Int32>, Int32, Int32, Int32, Int32, Int32, System.Nullable`1<Nop.Core.Domain.Catalog.ProductType>, Boolean, System.Nullable`1<Boolean>, System.Nullable`1<System.Decimal>, System.Nullable`1<System.Decimal>, Int32, System.String, Boolean, Boolean, Boolean, Int32, System.Collections.Generic.IList`1<Int32>, Nop.Core.Domain.Catalog.ProductSortingEnum, Boolean)'.  
The details for the log entry.Full message:  System.MissingMethodException: Method not found: 'Nop.Core.IPagedList`1<Nop.Core.Domain.Catalog.Product> Nop.Services.Catalog.IProductService.SearchProducts(Int32, Int32, System.Collections.Generic.IList`1<Int32>, Int32, Int32, Int32, Int32, Int32, System.Nullable`1<Nop.Core.Domain.Catalog.ProductType>, Boolean, System.Nullable`1<Boolean>, System.Nullable`1<System.Decimal>, System.Nullable`1<System.Decimal>, Int32, System.String, Boolean, Boolean, Boolean, Int32, System.Collections.Generic.IList`1<Int32>, Nop.Core.Domain.Catalog.ProductSortingEnum, Boolean)'. at FoxNetSoft.Plugin.Feed.Manager.Controllers.FeedsController.ProductFilterList(DataSourceRequest command, Int32 feedId, Int32 categoryId) at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeActi

Do you use original NopCommerce dll?

Yes, we tried it with a fresh NopCommerce 3.4 installation to verify that it wasn't due to our modifications.  We had the same problem with vanilla NopCommerce.

Send me the file Nop.Services.dll from Bin folder.
I'll verify.
My email is sypport@foxnetsoft.com

I downloaded the latest plugin and tried again.  I am no longer receiving that error.  However, when I go to generate a PriceGrabber feed, nothing happens.  It pauses for a moment and refreshes the page, but no feed is generated.

I enabled debug and I see the following in the log file:

2015.04.20 16:25:55:1647*******
FeedManagerService. LoadFeedAttribute
               feed.Id=6
               filename=D:\www\MRLv3Test\Plugins\FoxNetSoft.FeedManager\FeedSchema\pricegrabber.xml
               D:\www\MRLv3Test\Plugins\FoxNetSoft.FeedManager\FeedSchema\pricegrabber.xml Exists
               Deserialize Successfully

2015.04.20 16:25:55:2739*******
FeedsController. ProductFilterList. feedId=6, categoryId=0
2015.04.20 16:25:55:6995*******
FeedsController. CategoryFilterList. feedId=6, categoryId=0

Please select Default category on Info page.
You can't export products without any tanomy categories.

Sorry.
Did you press button "Generate"?
For every feed plugin generate report file, ex. pricegrabber_***.txt
Can you send me this file by email?

When I click Generate, the page reloads, but nothing is added under Files.  I don't see a generated file.  I've attached a screenshot of my info screen.

Yes, I have selected a default category on the info tab.

Sorry, I intended to upload a screenshot, but there isn't an upload button.

Can you can send me print screen and the file pricegrabber_***.txt  to email support@foxnetsoft.com?

I am having troubles with the Google Shopping feed. It tells me there is a products that can't be exported. I checked and there's nothing wrong with that product.

This is what the report file says:

23.05.2015 2:11:25
Feed - Google
product.count=16680, duration=00:28:03.7507288

Error. Cann't export product Id=10381, errorMessage=The underlying provider failed on Open.
Error. Cann't export product Id=10382, errorMessage=The underlying provider failed on Open.
22.05.2015 23:48:49
Feed - Google
product.count=0, duration=00:00:30.0788950

22.05.2015 23:41:36
Feed - Google
product.count=0, duration=00:00:30.0160168

Please advise.

I'll verify and answer you later.

Can you Enable debugging on plugin configure page?
Try to generate feed manually.
Send me the file FoxNetSoft.Plugin.Feed.Manager_log.txt from App_Data folder.

My email support  @  foxnetsoft.com.