This issue can be caused by a lack of connectivity to the TaskCentre store.
There are 2 types of TaskCentre store:
External
SQL
You can identify which store is in use by following these steps:
Run the TaskCentre Configurator utility.
Expand the Server node, then click on the Store node.
The Store type will be displayed.
To resolve this issue when an external store is configured, follow these steps:
Navigate to the folder named iwdb (This is usually located on the c:\ drive).
Open the folder to display the files in the folder.
Create a backup folder.
Copy all of the files with extension .da0 into the backup folder.
Copy the files iwsysdta.dat and iwsysdta.fpt into the backup folder.
Delete (from the iwdb folder) the files with extension .da0.
Delete (from the iwdb folder) the files iwsysdta.dat and iwsysdta.fpt.
Start the TaskCentre service.
Start the TaskCentre Schedule Agent service.
To resolve this issue when a SQL store is configured, rectify any network connectivity issues. Once this has been done, run the Configurator utility and follow these steps:
Expand the Server Node, then expand the Store node.
Click Configuration.
Select the Change store configuration check box.
Click Connect to / Create and alternative Microsoft SQL server Store.
Click Next.
Enter the Server Name, database name and credentials to connect to the SQL server.
Click Next, then click Save.