Is radiance required to run radiation analysis

the script was working fine but suddenly it started to show this error report and after I installed radiance ladybug is not finding

it? what am I not seeing please help?

At the moment, you have to install Radiance if you want to run Ladybug Radiation studies. You can find a link to a compatible version of Radiance in the compatibility matrix:

Note that we may change this in the future in order to make Ladybug free of dependencies on engines but it is required for now.