Both modules are corrupt after upgrade to dnn 7.1.2.

AssemblyVersion:7.1.2
PortalID:0
PortalName:Kenniscentrum reeën
UserID:-1
UserName:
ActiveTabID:391
ActiveTabName:Vraag en beantwoord
RawURL:/Vraagenbeantwoord/tabid/391/view/tags/sort/popular/Default.aspx
AbsoluteURL:/Default.aspx
AbsoluteURLReferrer:
UserAgent:Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke
ExceptionGUID:3174ff99-8a75-492e-8429-af7de669f372
InnerException:Could not load file or assembly 'WebFormsMvp, Version=1.2.0.0, Culture=neutral, PublicKeyToken=537f18701145dff0' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
FileName:
FileLineNumber:0
FileColumnNumber:0
Method:System.Reflection.RuntimeAssembly.GetType
StackTrace:

Any suggestions are welcome