Enable Remote errors for a Reporting Services Service Application
For a SharePoint mode report server installed with SQL Server 2012 or a newer version of Reporting Services, enable the service application setting Enable remote errors. The setting can be configured for each Reporting Services service application.
In SharePoint Central Administration, click Manage service applications in the Application Management group.
Find your Reporting Services service application and click the name of your service application.
Click System Settings.
Click Enable Remote Errors in the Security section.
Enable Remote Errors for a SharePoint Site
For a SharePoint mode report server installed with a version of Reporting Services prior to SQL Server 2012, enable the site setting Enable remote errors in local mode.
In Site Actions click Site Settings for the site you want to modify.
Click Reporting Services Site Settings in the Reporting Services group.
Click Enable remote errors in local mode.