Open Analysis Settings and calculate the Solar Loads again. This will populate the latest results for the model in its current state. Possibly, the model was modified or there was an error contacting the web server to get the solar data.
You may check there to see if there are any messages about your internet connection. A poor internet connection may not allow FenestraPro to calculate the Solar Loads or display the Charts. It may be helpful to close the application and restart. If this does not help. Close both the application and Revit and restart again.
There may be modeling issues causing this issue (gaps in the enclosure, generic geometry used instead of Revit elements etc). Please see this Section Model Preparation for more details.