Cannot remove application vault webcalender

[zid]

here the error we received

File "C:\inetpub\vhosts\35syd.ca/vault_scripts/webcalendar/APP-META.xml" isn't readable

---------------------- Debug Info -------------------------------
0: C:\Program Files\SWsoft\Plesk\admin\plib\SiteApps\FusionSiteAppMetaDataReader.php:117
FusionSiteAppMetaDataReader->__construct(string 'C:\inetpub\vhosts\35syd.ca/vault_scripts/webcalendar/APP-META.xml')
1: C:\Program Files\SWsoft\Plesk\admin\plib\SiteApps\class.SiteApp.php:232
SiteApp->readPackageMetadata()
2: C:\Program Files\SWsoft\Plesk\admin\plib\SiteApps\class.cSiteApp.php:571
cSiteApp->getMetadataReader()
3: C:\Program Files\SWsoft\Plesk\admin\plib\SiteApps\FusionSiteAppManager.php:924
FusionSiteAppManager->removeASPNETHandlers(object of type SiteApp)
4: C:\Program Files\SWsoft\Plesk\admin\plib\SiteApps\FusionSiteAppManager.php:805
FusionSiteAppManager->uninstallSiteApp(object of type SiteApp, boolean true, boolean true)
5: C:\Program Files\SWsoft\Plesk\admin\plib\SiteApps\class.SiteAppsList.php:484
SiteAppsList->uninstall(array)
6: C:\Program Files\SWsoft\Plesk\admin\htdocs\domains\hosting\removeSiteApps.php:51

tried to do a websrvmng reconfigure, but did not help also cannot renove database associate to the application.