KB44838: "Follow the instructions marked below by a red flag" error shows but there is no red flag when running an MDX cube report in MicroStrategy Web

SYMPTOM:
"Follow the instructions marked below by a red flag" error shows but there is no red flag when running an MDX cube report in Strategy Web, as shown below:

 
Follow the instructions marked below by a red flag.
 
STEPS TO REPRODUCE:
Follow the steps below to reproduce the issue:
 
NOTE:
The issue does not happen when the report is running in Strategy Developer.

• In Strategy Developer, create a Database Instance to connect to the MDX server.
• Go to Menu -> Schema -> MDX Cube Catalog, and import a cube from the MDX source.
• Select the imported cube, and go to Cube Mapping tab.
• Right mouse click on the attribute -> Map
• Select an existing attribute in the project, and map the attribute forms, as shown below:
  

• Save and close the MDX Cube Catalog.
• Update Schema.
• Create an MDX cube report, and select the imported cube.
• Add a prompt based on the mapped attribute, as shown below:
  

• Save and close the report.
• Run the report in Strategy Web. Select any element, and the issue happens after clicking on Run Report.

 
 
CAUSE:
This is a known issue with Strategy Web 10.x.
 
ACTION:
Currently this issue is being reviewed by Strategy for a potential code fix on an upcoming Strategy release.