It is the resolution string on line 155 as I expected. You are using a newer version of Radiance than the one from the compatibility matrix.
Here is the resolution string of your HDR:
In previous Radiance versions it is formatted like this:
Seems like it changed in this Radiance version. Since we are eventually going to bump the compatible Radiance version to a newer version at some point, I pushed a PR of the “HB Glare Postprocess” component that works with both resolution string formats. If @chris approves it should fix your problem now, but more importantly also avoid future problems when the compatibility matrix changes.