Could not load file or assembly 'Microsoft.AnalysisServices.SharePoint.Integration'
Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
In SharePoint 2010 environments that have Power Pivot for SharePoint, this error will occur if the application-level solution for Power Pivot did not deploy correctly.
Deploy the solution package.
In Central Administration, in System Settings, click Manage farm solutions.
Click Deploy Solution.
Choose the web application for which this error is occurring. If there is more than one web application, redeploy the solution for all of hem.