1. Solution exception:invalid literal for float(): -nan(ind)

I get the following error when trying to set up an incident radiation analysis with Ladybug 1.7, but only for certain EPW files. Some work fine, others give this exact error message:

Runtime error (ValueErrorException): invalid literal for float(): -nan(ind)

Unfortunately I have not the slightest idea what it means, so all help is greatly appreciated. I haven’t found any recent discussion about any similar issue, but please direct me if there already exists a thread about this. Thank you!