=== Error ===
`MediaWiki version:` **`n/a`**
```name=message
Error: Collection contains more than one element
at OO.ui.Element.static.unsafeInfuse https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:289:902
at OO.ui.Element.static.infuse https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:289:545
at OO.ui.infuse https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:286:29
at infuseSelectAllToHeader https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:1:263
at https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:2:260
at fire https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:159:198
at fireWith https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:160:391
at fire https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:634:436
at https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:651:1585
at mightThrow https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:162:141
at resolve/</process< https://de.wikipedia.org/w/load.php?lang=de&modules=ext.GlobalPreferences.global%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.cx.eventlogging.campaigns%7Cext.echo.api%2Cinit%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.client%2Ccookie%2ClengthLimit%2CtextSelection%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2CconfirmCloseWindow%2Ccookie%2Cexperiments%2Chtmlform%2CjqueryMsg%2Clanguage%2Cnotification%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.htmlform.ooui%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.notification.convertmessagebox%7Cmediawiki.page.ready%7Cmediawiki.special.preferences.ooui%7Cmediawiki.ui.button%7Cmediawiki.widgets.CheckMatrixWidget%2CSelectWithInputWidget%2CTitlesMultiselectWidget%2CUsersMultiselectWidget%2CvisibleLengthLimit%7Coojs-ui-widgets.icons%7Coojs-ui.styles.icons-content%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=q1nq5:162:800
```
=== Impact ===
=== Notes ===