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sfdc help 2sfdc help 2 

CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, execution of AfterInsert

I am getting the this error when I “Run The  Test Class”
*Error Details *

Error Message System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, eMa: execution of AfterInsert

caused by: System.NullPointerException: Attempt to de-reference a null object:

class.eMsgController.generateAutoresponse:line 32, coulmn1
trigger.eMa:line 6,column1:[]
stack trace: class.MyClass_TestClass.myUnitTest:line7,column 1

please help me out!!!!

Trigger.trgOrphanId: line 23, column 1: [] Stack Trace Class.testBatchDonorAllocation.myUnitTest: line 39, column 1
Evan KennedyEvan Kennedy
We can't really help you out on this error without seeing the code.

This exception means that something you're referencing is null.

For example:
String s = null;

s.trim();

This would cause a null pointer exception because "s" is null.