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Make sure the user has enough permissions. You can use the 'Check Permissions' option on the SharePoint site that you want to crawl.
Save your content source before creating or editing another one
Failing to save a content source before creating or editing another content source can result in an error.
ERROR [aspire]: Exception received attempting to get execute component command com.searchtechnologies.aspire.services.AspireException: Unable to find content source
Save the initial content source before creating or working on another.
Overview
Content Tools