An error has occurred during Report Processing

Error:

An error has occurred during report processing. Exception has been thrown by the target of an invocation. Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

An error has occurred during Report Processing

This tutorial is about how to solve the above mention error. This error is occurred when the unique, foreign-key field is existing in Table Adapter of DataSet. And this Table Adapter is used in the report Data Source. 

Table Adapter

Solution:

Its solution is very simple. Go to that Table Adapter in a DataSet which you use in a report. Select the unique, foreign-key field and then right click on it go to the “delete key” option and delete it.

Table Adapter Field Propertie | Delete Key

Save DataSet Table Adapter and run report again.