When draggin a visualization into a new blank report, the Visualization
Gallery appears with the thumbnail images of the available
visualizations, when clicking "OK" to add a visualization to the report, the below error message is received:
404 - Not Found
In 188.8.131.52, pallettes.json needs to be copied from /bi/common folder to the /common folder.
Resolving The Problem
Copy pallettes.json from /bi/common folder to the /common folder. Restart Cognos and IIS.
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15 June 2018