KB-1569 "An error occurred while retrieving the report" in Task per Process Model report

Symptoms

When looking at the Task per Process Model report, the following error appears:

The application server log throws the following error:

2016-12-15 19:20:53,204 [ajp-/0.0.0.0:8009-4] ERROR com.appiancorp.process.analytics2.service.ProcessAnalyticsServiceFacade - com.appiancorp.kougar.driver.exceptions.Signal: index
2016-12-15 19:20:53,204 [ajp-/0.0.0.0:8009-4] ERROR com.appiancorp.process.analytics2.display.ProcessAnalyticsReportData - com.appiancorp.kougar.driver.exceptions.Signal: index
java.lang.RuntimeException: com.appiancorp.kougar.driver.exceptions.Signal: index

Cause

Potential causes of this issue are:

A constant has been created with the same name as a task metric.
The Execution and Analytics engines are out of synchronization and need to be synchronized again.

Action

To fix this issue, first verify if a constant exists with the same name as a task metric. To do so, follow these steps:

Navigate to the Rules tab.
Using the search box, check if a constant with any of these names exist:
- task_avg_completion
- Completion
- task_completion_time
- is_process_ontime
- is_process_overdue
- is_task_favorite
- is_task_ontime
- is_task_overdue
- Lag
- NetCompletion
- NetLag
- NetWork
- process_completion_time
- process_deadline
- process_ee_id
- pm_avg_completion
- pm_avg_lag
- pm_avg_work
- process_start_time
- task_assignee_owner
- task_assignment_time
- task_attributed_to
- task_avg_lag
- task_avg_work
- task_deadline
- task_ee_id
- task_status
- total_completion_time
- total_lag_time
- total_work_time
- Work

If a constant with a similar name exists, remove it from the system.

After making sure that no constants exist with a same name as one in the list above, reset the analytics engines. Please refer to KB-1157 How to reset the analytics engines for self-managed installations of Appian for more details.

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: April 2018