Getting various errors when opening XML files

i have following different symptoms 1 of solutions work in (other solutions behaving normally):

- when open solution, same files open. doesn't matter if open different files , close / reopen... it's same files.

- when try open non-.cs file .tt file or .xml file gives me error , default editor wrong (some unrelated editor). can fix .tt when try fix .xml or .config problems remain.

- different errors when try open xml/config files. click on file, close error , click again , different message:

"the extender provider failed return extender object."

"renaming dependent file not allowed."

- can file open "open with" when error in activity log, , message in there:

  <entry>
    <record>860</record>
    <time>2013/09/06 19:28:33.215</time>
    <type>error</type>
    <source>editor or editor extension</source>
    <description>system.argumentexception: extender provider failed return extender object.&#x000d;&#x000a;   @ system.runtime.interopservices.marshal.throwexceptionforhrinternal(int32 errorcode, intptr errorinfo)&#x000d;&#x000a;   @ system.runtime.interopservices.marshal.throwexceptionforhr(int32 errorcode)&#x000d;&#x000a;   @ microsoft.visualstudio.nativemethods.throwonfailure(int32 hr, int32[] expectedhrfailure)&#x000d;&#x000a;   @ microsoft.visualstudio.shell.runningdocumenttable.finddocument(string moniker, ivshierarchy&amp; hierarchy, uint32&amp; itemid, uint32&amp; doccookie)&#x000d;&#x000a;   @ microsoft.xmleditor.xmlhelper.getcanonicalnamewithoutview(iserviceprovider site, string fname)&#x000d;&#x000a;   @ microsoft.xmleditor.xmlfileinfoservice.renameorremovecachefileinfo(string fname)&#x000d;&#x000a;   @ microsoft.xmleditor.package.getorcreatefileinfo(string fname, string text)&#x000d;&#x000a;   @ microsoft.xmleditor.package.getorcreatefileinfo(string fname, ivstextlines buffer)&#x000d;&#x000a;   @ microsoft.xmleditor.xmllanguageservice.getscanner(ivstextlines buffer)&#x000d;&#x000a;   @ microsoft.visualstudio.package.languageservice.getcolorizer(ivstextlines buffer)&#x000d;&#x000a;   @ microsoft.visualstudio.package.languageservice.getcolorizer(ivstextlines buffer, ivscolorizer&amp; result)&#x000d;&#x000a;   @ microsoft.visualstudio.editor.implementation.languageserviceclassificationtagger.trycreatetagger(itextbuffer textbuffer, ivsfontsandcolorsinformationservice fontandcolorinformation, int32 longbufferlinethreshold, languageserviceclassificationtagger&amp; classifier)&#x000d;&#x000a;   @ microsoft.visualstudio.editor.implementation.languageserviceclassificationtaggerprovider.createtagger[t](itextbuffer buffer)&#x000d;&#x000a;   @ microsoft.visualstudio.text.tagging.implementation.tagaggregator`1.gathertaggers(itextbuffer textbuffer)</description>
  </entry>

i've tried deleting settings, clearing out bin , obj folders, restarting comp, deleting and then re-downloading code our source control (noone else having issue), but can't seem fix issue. please help.

hi anurag_,

  welcome msdn forum support.

  i'm aware question asp.net 3.5, in thought resolved by:

• closing solution in visual studio
• deleting obj , bin directories problematic project.

  if problem still appears, seems way reinstall develop environment again.

  sincerely,

  jason wang

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