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“Failed to Create Thumbnail” — Meaning and Fixes

This error occurs because the view of the model is in some way inappropriate.

This is almost always a user-generated problem, caused by the following: 
1. eye position is wrong e.g. inside the wall or component (thus no light reaches the eye).
2. inside a zone with no windows (openings) and no lights.
3. simulation parameters are such that insufficient light reaches the eye.

More information might be available in Radiance.log file in the Radiance folder inside the project folder