Hi,
thanks for the reply. The orignal name of the HDR was “spiaggia_di_mondello_4k” and I got it from HDRI Haven, I just renamed it to see if the name as a reason for this. The .blend file is the general starting file of Blender just with the environment texture added for test purposes. I am not sure if uploading this of any help. As I said a .blend file I received from here also throws the same error message.
Could it be something with the GPU, in other posts I read about GPU´s crashing cmft and then a new cmft version was set as standard, but that post was from something around 2017. I switched between cycles and eevee and cpu and gpu rendering. But i guess armory is not really bothering about this setting as it always behaves the same. Or is there some setting in the background that needs to be changed. In the mentioned post there were talks about a switch forcing cmft to cpu computing.
In thebuild folder there a only two files under assets/envmaps. These are test2_irradiance.arm and test2_radiance.hdr. But not the file armory is looking for.