Product:
IBM Cognos BI 10.2.1
Microsoft Windows 2008 R2 server

Symptom:
User is not able to execute a event task from Cognos connection.

Error message:
CNC-ASV-0048 Error building report template: {0} CAF-WRN-2082 An error has occurred. Please contact your administrator. The complete error has been logged by CAF with SecureErrorID:2014-05-21-17:34:46.790-#24
Above is because you do not have any capability on the event.

CM-REQ-4012 You do not have the appropriate permissions to update or delete the object “/Transient/2014-05-21T13:44:32.295Z/ eventname” or a related object.

RSV-DST-0014 Unable to deliver the output of the report. See the run history details for more information. Ensure that the required services are started. Ensure that the user account is configured to distribute the output in the requested manner. CAF-WRN-2082 An error has occurred. Please contact your administrator. The complete error has been logged by CAF with SecureErrorID:2014-05-21-16:01:43.170-#2

Above because you do not have WRITE rights on the event object.

QE-DEF-0157 The Model or package /content/folder xxx does not exist or you are not allowed to use it because of security settings.

Above because you do not have rights on the framework package that is used by the event.

Solution:
Add the user to the Cognos groups for security or capabilities that will give rights to use Event Studio.

You also need to have WRITE rights on the event itself in Cognos Connection.
Go to the folder where you have your Event task, click on more.
Click set properties
Click on permissions
Ensure that the group the user is member of is here, and that it is Granted the;
Read, Write, Execute and Traverse rights.

Click OK and test with the user again.
You may have to logout and login again to make the security changes take affect.