In this article I will explain with an example, how to resolve the error. "An error occurred during local report processing.
Report 'Report' contains external images. The EnableExternalImages property has not been set for this report.”
 
 

Error

The following error occurs when EnableExternalImages has not been defined or set to TRUE.
Exception: The enable externalimages property has not been set for this report
 
 

Solution

In order to get rid of this error, you need to make sure the EnableExternalImages of the report has been set to TRUE.
One can define the EnableExternalImages property as shown below.
C#
reportViewer1.LocalReport.EnableExternalImages =  true;
 
VB.Net
reportViewer1.LocalReport.EnableExternalImages =  True