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Umbraco Error

A collection of typical errors I’m encountering while developing with Umbraco. Usually they are easy to solve but the error-message is not intuitive.

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Umbraco: The OwinStartupAttribute.FriendlyName value ‘UmbracoDefaultOwinStartup’ does not match the given value

Umbraco error: Owin​​Startup​Attribute.​​Friendly​Name

Everybody who is developing with Umbraco sooner or later gets this error message:The following errors occurred while attempting to load the app. - The OwinStartupAttribute.FriendlyName...