xamarin.forms - "XamlCTask" task failed unexpectedly" error when building with the new Xamarin Forms -


after i've updated latest xamarin.forms (2.3.4.224) keep getting build errors. knows be?

i suspect might have new behavior changes have introduced new version regarding attached properties (but don't know that means)

more info here https://forums.xamarin.com/discussion/92455/xamarin-forms-2-3-4-224

and here build log

error       "xamlctask" task failed unexpectedly. system.argumentexception: item same key has been added.  server stack trace:     @ system.throwhelper.throwargumentexception(exceptionresource resource)    @ system.collections.generic.dictionary`2.insert(tkey key, tvalue value, boolean add)    @ xamarin.forms.xaml.xamlparser.parsexamlelementfor(ielementnode node, xmlreader reader)    @ xamarin.forms.xaml.xamlparser.readnode(xmlreader reader, boolean nested)    @ xamarin.forms.xaml.xamlparser.parsexamlelementfor(ielementnode node, xmlreader reader)    @ xamarin.forms.xaml.xamlparser.readnode(xmlreader reader, boolean nested)    @ xamarin.forms.xaml.xamlparser.parsexamlelementfor(ielementnode node, xmlreader reader)    @ xamarin.forms.xaml.xamlparser.readnode(xmlreader reader, boolean nested)    @ xamarin.forms.xaml.xamlparser.parsexamlelementfor(ielementnode node, xmlreader reader)    @ xamarin.forms.xaml.xamlparser.parsexaml(rootnode rootnode, xmlreader reader)    @ xamarin.forms.build.tasks.xamltask.parsexaml(stream stream, typereference typereference)    @ xamarin.forms.build.tasks.xamlctask.execute(ilist`1& thrownexceptions)    @ xamarin.forms.build.tasks.xamltask.execute()    @ system.runtime.remoting.messaging.stackbuildersink._privateprocessmessage(intptr md, object[] args, object server, object[]& outargs)    @ system.runtime.remoting.messaging.stackbuildersink.syncprocessmessage(imessage msg)  exception rethrown @ [0]:     @ system.runtime.remoting.proxies.realproxy.handlereturnmessage(imessage reqmsg, imessage retmsg)    @ system.runtime.remoting.proxies.realproxy.privateinvoke(messagedata& msgdata, int32 type)    @ microsoft.build.framework.itask.execute()    @ microsoft.build.backend.taskexecutionhost.microsoft.build.backend.itaskexecutionhost.execute()    @ microsoft.build.backend.taskbuilder.<executeinstantiatedtask>d__26.movenext() shared


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