After releasing ASP.NET and Web Tools 2012.2, which is also included in Visual Studio 2012 update 2, we’ve received a few customer feedback about their VS shows an error dialog saying:<\/p>\n
\nAn exception has been encountered. This may be caused by an extension.<\/p>\n<\/blockquote>\n
\nYou can get more information by examining the file ‘C:Users<username>AppDataRoamingMicrosoftVisualStudio12.0ActivityLog.xml’.<\/p>\n<\/blockquote>\n
When looking at ActivityLog.xml, the following error message may show up:<\/p>\n
\nSystem.ComponentModel.Composition.ImportCardinalityMismatchException: Duplicate EditorFormatDefinition exports with identical name attributes exist. Duplicate name is LESSCSSVARIABLEDECLARATIONCLASSIFICATIONFORMAT<\/p>\n<\/blockquote>\n
To solve this problem, one just need to update the “Web Essentials 2012<\/a>” extension to the latest version.<\/p>\n
What happened is author Mads<\/a> (also PM in the Web editor team) graduated LESS and CoffeeScript feature from web essentials 2012 and put these feature officially in ASP.NET and Web Tools 2012.2 (see change log<\/a> for version details). So using an old version of Web Essentials will conflict with the newest version of VS2012 update 2.<\/p>\n
Thanks for the support! And keep enjoying Web Essentials!<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"
After releasing ASP.NET and Web Tools 2012.2, which is also included in Visual Studio 2012 update 2, we’ve received a few customer feedback about their VS shows an error dialog saying: An exception has been encountered. This may be caused by an extension. You can get more information by examining the file ‘C:Users<username>AppDataRoamingMicrosoftVisualStudio12.0ActivityLog.xml’. When looking […]<\/p>\n","protected":false},"author":410,"featured_media":58792,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[197],"tags":[7412,7435],"class_list":["post-1684","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aspnet","tag-visual-studio-2012","tag-web-essentials"],"acf":[],"blog_post_summary":"
After releasing ASP.NET and Web Tools 2012.2, which is also included in Visual Studio 2012 update 2, we’ve received a few customer feedback about their VS shows an error dialog saying: An exception has been encountered. This may be caused by an extension. You can get more information by examining the file ‘C:Users<username>AppDataRoamingMicrosoftVisualStudio12.0ActivityLog.xml’. When looking […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/posts\/1684","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/users\/410"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/comments?post=1684"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/posts\/1684\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/media\/58792"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/media?parent=1684"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/categories?post=1684"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/dotnet\/wp-json\/wp\/v2\/tags?post=1684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}