Daylight Simulation writeRADAndMaterialFiles error

Getting this no so clear error when trying to run a Daylight model…

Grid-based Radiance simulation
The component is checking ad, as, ar and aa values. This is just to make sure that the results are accurate enough.
Good to go!
Current working directory is set to: c:\ladybug\unnamed\gridBasedSimulation
Runtime error (KeyNotFoundException): 147e897c-935f-4c6e-83be-0410dc8273e5

line 8378, in callFromHoneybeeHive, “”
line 1682, in writeRADAndMaterialFiles, “”
line 188, in main, “”
line 253, in script

any ideas?