The error says that the template - ~/Sitefinity/Admin/ControlTemplates/Generic_Content/ContentEditView.ascx
could not be found in your solution. Please check the ~/Sitefinity/Admin/ControlTemplates/Generic_Content folder.
This template is an external resource and most probably you have used it before. The template could be mapped only through App_Data/Configuration/Telerik.Sitefinity.Configuration.ControlsConfig.xml
, so you could remove the <viewSettings> used to map the template from ControlsConfig file and restart the application.
You may find this KB helpful How to map a template
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