Correct pyflakes error
@@ -192,7 +192,7 @@ class FoVBackgroundMaker(Maker):
"""
if isinstance(dataset.counts.geom, RegionGeom):
- raise TypeError(f"FoVBackgroundMaker does not support region based datasets.")
+ raise TypeError("FoVBackgroundMaker does not support region based datasets.")
mask_fit = dataset.mask_fit
if mask_fit:
