azure web sites - DNN upgrade failed from 7.3.2 to 8.0.3 failed but after rollback menu does not show -


we did upgrade 7.3.2 8.0.3 , menu not show after did roll back. content , functionality works properly. when looking log find following exception in it. site hosted in azure. 

2017-07-27 12:09:30,915 [rd00155d825c0a][thread:14][error] dotnetnuke.services.exceptions.exceptions - system.invalidoperationexception: not locate razor host factory type: system.web.mvc.mvcwebrazorhostfactory, system.web.mvc    @ system.web.webpages.razor.webrazorhostfactory.createfactory(string typename)    @ system.collections.concurrent.concurrentdictionary`2.getoradd(tkey key, func`2 valuefactory)    @ system.web.webpages.razor.webrazorhostfactory.createhostfromconfigcore(razorwebsectiongroup config, string virtualpath, string physicalpath)    @ system.web.webpages.razor.webrazorhostfactory.createhostfromconfig(string virtualpath, string physicalpath)    @ system.web.webpages.razor.razorbuildprovider.gethostfromconfig()    @ system.web.webpages.razor.razorbuildprovider.createhost()    @ system.web.webpages.razor.razorbuildprovider.ensuregeneratedcode()    @ system.web.webpages.razor.razorbuildprovider.get_codecompilertype()    @ system.web.compilation.buildprovider.getcompilertypefrombuildprovider(buildprovider buildprovider)    @ system.web.compilation.buildproviderscompiler.processbuildproviders()    @ system.web.compilation.buildproviderscompiler.performbuild()    @ system.web.compilation.buildmanager.compilewebfile(virtualpath virtualpath)    @ system.web.compilation.buildmanager.getvpathbuildresultinternal(virtualpath virtualpath, boolean nobuild, boolean allowcrossapp, boolean allowbuildinprecompile, boolean throwifnotfound, boolean ensureisuptodate)    @ system.web.compilation.buildmanager.getvpathbuildresultwithnoassert(httpcontext context, virtualpath virtualpath, boolean nobuild, boolean allowcrossapp, boolean allowbuildinprecompile, boolean throwifnotfound, boolean ensureisuptodate)    @ system.web.compilation.buildmanager.getvirtualpathobjectfactory(virtualpath virtualpath, httpcontext context, boolean allowcrossapp, boolean throwifnotfound)    @ system.web.compilation.buildmanager.getcompiledtype(virtualpath virtualpath)    @ system.web.compilation.buildmanager.getcompiledtype(string virtualpath)    @ dotnetnuke.web.razor.razorengine.createwebpageinstance()    @ dotnetnuke.web.razor.razorengine.initwebpage()    @ dotnetnuke.web.razor.razorengine..ctor(string razorscriptfile, moduleinstancecontext modulecontext, string localresourcefile) 2017-07-27 12:09:31,006 [rd00155d825c0a][thread:14][error] dotnetnuke.services.exceptions.exceptions - system.nullreferenceexception: object reference not set instance of object.    @ dotnetnuke.web.razor.razorengine.render[t](textwriter writer, t model)


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