Split off from T228594:
https://en.wikisource.org/w/index.php?title=Page:Mexico_under_Carranza.djvu/95&action=edit&debug=true Open this, or any other page in edit mode.
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The following are the error messages (5) in the debug console generated by activating the OCR:
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Exception: ve.init is undefined mw.libs.ve.EditingTabDialog.prototype.getSetupProcess/<@https://en.wikisource.org/w/load.php?lang=en&modules=ext.visualEditor.switching%7Coojs-ui%7Coojs-ui.styles.icons-accessibility&skin=vector&version=0wrn2bo:4:376 proceed/<@https://en.wikisource.org/w/load.php?lang=en&modules=ext.CodeMirror%2CTemplateWizard%2Ccharinsert%2CeventLogging%2CnavigationTiming%2CwikimediaEvents%7Cext.CodeMirror.data%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.echo.api%2Cinit%7Cext.proofreadpage.icons%7Cext.proofreadpage.page.edit%2Cnavigation%7Cext.proofreadpage.ve.pageTarget.init%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.visualEditor.desktopArticleTarget.init%7Cext.visualEditor.progressBarWidget%2CsupportCheck%2CtargetLoader%2CtempWikitextEditorWidget%2Ctrack%2Cve%7Cext.wikimediaEvents.loggedin%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.accessKeyLabel%2CcheckboxShiftClick%2Cclient%2Ccookie%2CgetAttrs%2ChighlightText%2ClengthLimit%2CmakeCollapsible%2Cmousewheel%2CprpZoom%2Csuggestions%2CtabIndex%2CtextSelection%2Cthrottle-debounce%7Cjquery.makeCollapsible.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CForeignStructuredUpload%2CForeignUpload%2CRegExp%2CString%2CTitle%2CUpload%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2Cicon%2CjqueryMsg%2Clanguage%2Cnotify%2CsearchSuggest%2Cstorage%2Ctemplate%2Cuser%2Cutil%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.ForeignStructuredUpload.BookletLayout%7Cmediawiki.Upload.BookletLayout%2CDialog%7Cmediawiki.action.edit%7Cmediawiki.action.edit.collapsibleFooter%7Cmediawiki.language.specialCharacters%7Cmediawiki.legacy.wikibits%7Cmediawiki.libs.jpegmeta%2Cpluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.regexp%7Cmediawiki.widgets.CategoryMultiselectWidget%2CDateInputWidget%2CStashedFileWidget%2CUserInputWidget%2CvisibleLengthLimit%7Cmediawiki.widgets.DateInputWidget.styles%7Coojs-ui-toolbars.icons%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-content%2Cicons-editing-advanced%2Cicons-editing-citation%2Cicons-editing-core%2Cicons-editing-list%2Cicons-editing-styling%2Cicons-interactions%2Cicons-media%2Cicons-movement%7Cskins.vector.js%7Cuser.defaults%7Cwikibase.client.action.edit.collapsibleFooter&skin=vector&version=0as2p6p:712:96 mightThrow@https://en.wikisource.org/w/load.php?lang=en&modules=ext.CodeMirror%2CTemplateWizard%2Ccharinsert%2CeventLogging%2CnavigationTiming%2CwikimediaEvents%7Cext.CodeMirror.data%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.echo.api%2Cinit%7Cext.proofreadpage.icons%7Cext.proofreadpage.page.edit%2Cnavigation%7Cext.proofreadpage.ve.pageTarget.init%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.visualEditor.desktopArticleTarget.init%7Cext.visualEditor.progressBarWidget%2CsupportCheck%2CtargetLoader%2CtempWikitextEditorWidget%2Ctrack%2Cve%7Cext.wikimediaEvents.loggedin%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.accessKeyLabel%2CcheckboxShiftClick%2Cclient%2Ccookie%2CgetAttrs%2ChighlightText%2ClengthLimit%2CmakeCollapsible%2Cmousewheel%2CprpZoom%2Csuggestions%2CtabIndex%2CtextSelection%2Cthrottle-debounce%7Cjquery.makeCollapsible.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CForeignStructuredUpload%2CForeignUpload%2CRegExp%2CString%2CTitle%2CUpload%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2Cicon%2CjqueryMsg%2Clanguage%2Cnotify%2CsearchSuggest%2Cstorage%2Ctemplate%2Cuser%2Cutil%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.ForeignStructuredUpload.BookletLayout%7Cmediawiki.Upload.BookletLayout%2CDialog%7Cmediawiki.action.edit%7Cmediawiki.action.edit.collapsibleFooter%7Cmediawiki.language.specialCharacters%7Cmediawiki.legacy.wikibits%7Cmediawiki.libs.jpegmeta%2Cpluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.regexp%7Cmediawiki.widgets.CategoryMultiselectWidget%2CDateInputWidget%2CStashedFileWidget%2CUserInputWidget%2CvisibleLengthLimit%7Cmediawiki.widgets.DateInputWidget.styles%7Coojs-ui-toolbars.icons%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-content%2Cicons-editing-advanced%2Cicons-editing-citation%2Cicons-editing-core%2Cicons-editing-list%2Cicons-editing-styling%2Cicons-interactions%2Cicons-media%2Cicons-movement%7Cskins.vector.js%7Cuser.defaults%7Cwikibase.client.action.edit.collapsibleFooter&skin=vector&version=0as2p6p:223:916 resolve/</process<@https://en.wikisource.org/w/load.php?lang=en&modules=ext.CodeMirror%2CTemplateWizard%2Ccharinsert%2CeventLogging%2CnavigationTiming%2CwikimediaEvents%7Cext.CodeMirror.data%7Cext.centralNotice.geoIP%7Cext.centralauth.ForeignApi%7Cext.centralauth.centralautologin.clearcookie%7Cext.echo.api%2Cinit%7Cext.proofreadpage.icons%7Cext.proofreadpage.page.edit%2Cnavigation%7Cext.proofreadpage.ve.pageTarget.init%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.visualEditor.desktopArticleTarget.init%7Cext.visualEditor.progressBarWidget%2CsupportCheck%2CtargetLoader%2CtempWikitextEditorWidget%2Ctrack%2Cve%7Cext.wikimediaEvents.loggedin%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.accessKeyLabel%2CcheckboxShiftClick%2Cclient%2Ccookie%2CgetAttrs%2ChighlightText%2ClengthLimit%2CmakeCollapsible%2Cmousewheel%2CprpZoom%2Csuggestions%2CtabIndex%2CtextSelection%2Cthrottle-debounce%7Cjquery.makeCollapsible.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CForeignStructuredUpload%2CForeignUpload%2CRegExp%2CString%2CTitle%2CUpload%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2Cicon%2CjqueryMsg%2Clanguage%2Cnotify%2CsearchSuggest%2Cstorage%2Ctemplate%2Cuser%2Cutil%2Cwidgets%7Cmediawiki.ForeignApi.core%7Cmediawiki.ForeignStructuredUpload.BookletLayout%7Cmediawiki.Upload.BookletLayout%2CDialog%7Cmediawiki.action.edit%7Cmediawiki.action.edit.collapsibleFooter%7Cmediawiki.language.specialCharacters%7Cmediawiki.legacy.wikibits%7Cmediawiki.libs.jpegmeta%2Cpluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.regexp%7Cmediawiki.widgets.CategoryMultiselectWidget%2CDateInputWidget%2CStashedFileWidget%2CUserInputWidget%2CvisibleLengthLimit%7Cmediawiki.widgets.DateInputWidget.styles%7Coojs-ui-toolbars.icons%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-content%2Cicons-editing-advanced%2Cicons-editing-citation%2Cicons-editing-core%2Cicons-editing-list%2Cicons-editing-styling%2Cicons-interactions%2Cicons-media%2Cicons-movement%7Cskins.vector.js%7Cuser.defaults%7Cwikibase.client.action.edit.collapsibleFooter&skin=vector&version=0as2p6p:224:589 undefined 2 load.php:226:749