SYMPTOM:
When a user invokes the URL in the Task Administrator page as shown below:

The following error appears in Strategy Web 9.x:

There was a problem retrieving data:
CAUSE:
The error occurs when the server name used in the URL to access the Task Administrator page is different from the one used for the task URL as shown below:
http://localhost/MicroStrategy/asp/TaskAdmin.aspx
http://<server-name>/MicroStrategy/asp/TaskAdmin.aspx?taskId=browseAttributeForms&taskEnv=juil_iframe&taskContentType=JSON
ACTION:
Make sure the server name used for the access URL and the task URL are the same.